Papers & Talks
Prof. Dr.
Basilius Jacobus Bert Groen

Papers Given at International Scholarly Conferences

‘The Anointing of the Sick in the Orthodox Church of Greece: Differences between Theory and Practice’
10th International Congress of the Societas Liturgica, Mödling (near Vienna), 19 August 1983.

‘Symeon of Thessalonica and the Anointing of the Sick’
9th International Conference on Patristic Studies, Oxford, 7 September 1983.

‘The Latin and the Byzantine Rites of the Anointing of the Sick during the 10th and 11th Centuries’
Congress on “The Empress Theophano, Byzantium, and the West 950-1050”, Hernen (near Nijmegen), 30 May 1991.

‘The Trojan Horse and a Grecian Gift: Present-Day Greek Orthodox Reactions to the Union of Brest’
Congress on “Four Hundred Years Union of Brest (1596-1996): A Critical Re-evaluation”, Hernen and Nijmegen, 29 March 1996.

‘Εθνικισμός και ελληνική ορθοδοξία’ (‘Nationalism and Greek Orthodoxy’)
First Congress of the European Society of Modern Greek Studies, Berlin, 3 October 1998.

‘Apophatische Theologie als Grunddimension christlicher Ekklesiologie: Beobachtungen zum Beitrag von Marios Begzos’
11th Scientific Consultation of the Societas Oecumenicia, Hamburg, 25 August 2000.

‘Die Diskussion über die Kremation und die Totenriten im heutigen Griechenland’ Congress of the “Arbeitsgemeinschaft katholischer Liturgikdozentinnen und -dozenten im deutschen Sprachgebiet (AKL)”, Schmochtitz (near Bautzen, Germany), 20 Sep­tember 2000.

‘The Anointing of the Sick between Continuity and Discontinuity’ (in Dutch)
Conference of the Institute of Liturgical and Ritual Studies at Tilburg, the Netherlands’ Research Organization (NWO) and the Theological Faculty of the Catholic University Leuven on “Life Rituals and Sacramentality”, Soesterberg (near Utrecht), 22 May 2001.

‘Dominant Orthodoxy, Religious Minorities, and Human Rights in Greece’
Conference of the University of Leeds, the Institute of Eastern Christian Studies at Nijmegen, and the Inter-University Institute of Missiological and Ecumenical Research at Utrecht, on “Orthodox Christianity and Contemporary Europe”, Leeds, 26 June 2001.

‘“Burying the Dead is Christian, Burning them is Pagan”: The Present Controversy on Cremation in Greece and Greek Orthodox Funeral Rites’
18th International Congress of the Societas Liturgica, Santa Clara University, California, 14 August 2001.

‘Jewish Saints and Anti-Judaism in the Present-Day Byzantine Liturgy’
19th International Congress of the Societas Liturgica, Eindhoven, 13 August 2003.

‘Liturgical Chant and Anti-Judaism in Current Byzantine Rite’
Conference of the Belgian Institutum Iudaicum on “Music and Judaism”, Brussels, 24 November 2003.

‘Antijudaismus in der römischen und in der byzantinischen Liturgie’
Conference on biblical studies organized by the theological institutes and faculties of the Universities of Bamberg, Bayreuth, and Graz, Graz, 26 September 2004.

‘Kontinuität und Diskontinuität der Krankensalbung’
20th International Congress of the Societas Liturgica, Dresden, 10 August 2005.

‘Das römische Direktorium über die Volksfrömmigkeit und die Liturgie: Vorstellung und Analyse’
Congres of the “Équipe Européenne de Catéchèse”, Graz, 3 June 2006.

‘New Challenges for the Study of Eastern Christian Liturgy’
First Congress of the Society of Oriental Liturgy, Eichstätt, Germany, 27 July 2006.

‘“Just Like in the Early Church”: Hermeneutics of the Use of Early Liturgical Practice for Modern Liturgical Reform’
Symposium Vindobonense organized by the Institute of Liturgical Studies, University of Vienna, and the Pro Oriente Foundation, Vienna, 19 November 2007.

‘Theologie und wissenschaftliche Forschung: eine katholische und ökumenische Perspektive’ Conference of the “Gesellschaft für das Studium des Christlichen Ostens” and the University of Vienna in cooperation with several Russian-Orthodox theological institutes at Moscow, Vienna, 7 November 2008.

‘The Kontakion on the Birth of Jesus Christ by Romanos Melodos’
Third International Workshop on Jewish and Christian Liturgies, Ben Gurion University of the Negev, Israel, 25 February 2009.

‘Adequate Liturgical Language and Spiritual Growth’
Symposium “Liturgy and Maturation”, Pontifical Liturgical Institute Sant’ Anselmo, Milwaukee, USA, 6 January 2010.

‘The Close Links between Liturgy and Diakonia: Theological Observations and Several Examples’
Third Congress of the Society of Oriental Liturgy, Volos, Greece, 27 May 2010.

‘The Rationale of the Liturgy Curriculum at the Institute of Liturgical Studies, Christian Fine Arts, and Hymnology, University of Graz, Austria’
Symposium “Rationales for Liturgy Curricula”, Pontifical Liturgical Institute Sant’ Anselmo, Rome, 29 May 2010 (paper read in my absence).

‘Christianity, Islam, and Judaism in Bulgaria: Challenges for Interfaith Relations’
Scientific Consultation of the Societas Oecumenica, Orthodox Theological Faculty University of Belgrade, 27 August 2010.

‘Der Stellenwert heiliger Bilder in der christlichen Liturgie’
Congress “Bild und Religion – Religion und Bild”, University of Regensburg, 27 November 2010.

‘Trinitarische Theologie aus den Schätzen des byzantinischen Ritus’
Conference “Trinität: Die Drei-Einheit Gottes im theologischen und künstlerischen Diskurs der Gegenwart”, University of Graz, 21 June 2011.

‘Baptism, Initiation, and Detraditionalization’
23th International Congress of the Societas Liturgica, Rheims, 9 August 2011.

‘The Lesser Water Sanctification in Greek Orthodoxy’
Fourth International Congress of the Society of Oriental Liturgy, University of Notre Dame, Lebanon, 11 July 2012.

‘The Liturgical Reform Initiated by the Second Vatican Council: Equilibrium between Papacy, Curia, Bishops’ Conferences, Local Bishops, and the People of God’
Annual Meeting of Saint Irenaeus Joint Orthodox-Catholic Working Group, Comunità di Bose, Italy, 2 November 2012.

‘Liturgical Studies Today: Some Challenges and Perspectives’, Conference ‘Syriac Sacred Music’
Saint Ephrem Ecumenical Research Institute, Kottayam, India, 28 February 2013.

‘Einige Aspekte des Wandels der heutigen mitteleuropäischen rituell-liturgischen Landschaft’
Expert Symposium “Wandel christlicher Rituale in Mitteleuropa im Kontext einer pluralisierten Rituallandschaft”, University of Vienna, 7-8 June 2013.

‘Liturgical Language and Vernacular Tongues: Finding the Right Words in the Ritual Encounter with God’
24th International Congress of the Societas Liturgica, Würzburg, 7 August 2013.

‘Liturgische Theologie, Feldforschung und religiöse Volkskultur’
International Conference “Lex credendi – Lex vivendi – Lex celebrandi: Orthodoxe Theologie im Kontext der Liturgiewissenschaft”, University of Munich, 24 April 2014.

‘From Holy Sepulcher to Interactive Web 2.0: Several Current Developments of Eastern Christian Liturgy and Religious Popular Culture’
Presidential Address, Fifth International Congress of the Society of Oriental Liturgy, Saint Vladimir’s Orthodox Theological Seminary, New York, 10 June 2014.

‘Therapeutic Water and the Small Water Blessing in the Greek Orthodox Tradition: Some Historical Flashbacks’
Annual Meeting of the North American Academy of Liturgy, Minneapolis, 3 January 2015.

‘The Network of UNESCO-Chairs on Intercultural and Interreligious Dialogue and the Preservation of Religious Popular Culture, Including Sacred Music’
Conference on the Safeguarding of Eastern Christian Sacred Music, University of Notre Dame, Rome, 25 May 2015.

‘‘For the Sanctification and Healing of Soul and Body’: The Small Water Blessing and the Anointing of the Sick in Byzantine Euchologia’,
Conference on Byzantine prayer books as sources for social history: ‘In Church and at Home: Byzantine Religious Life, its Sources and their Study’, Austrian Academy of Sciences and University of Vienna, 7 April 2016.

‘Die griechischen Schriftsteller Alexandros Papadiamantis und Alexandros Moraïtidis als Verteidiger der Orthodoxie gegen die europäische Aufklärung und ihre Nachwirkung bis heute’
International Congress of the Pro Oriente Committee for Southeastern European History: ‘Leitfiguren der “Europäisierungen” Südosteuropas im langen 19. Jahrhundert’, University of Vienna and University of Graz, 25 October 2016.

‘The Constantinopolitan Liturgical Tradition and the West’
International Conference on ‘Ecumenical Patriarchate and Divine Worship’, Patriarchal Institute of Patristic Studies, Thessalonica, 1 December 2016

‘Orthodox Liturgy in the West: Identity, Adaptation and Alienation’
First International Conference of the Louvain Centre for Eastern and Oriental Christianity: ‘Eastern and Oriental Churches in the West in the Twenty-First Century: Challenges and Opportunities’, Katholieke Universiteit Leuven, 5 December 2016.

‘Ein gemeinsames Osterdatum?’
Pro Oriente Conference: ‘Liturgie als Chance und Herausforderung für die Ökumene: Beiträge der Liturgiewissenschaft für die Einheit der Kirche’, Catholic Private University Linz, 8 February 2017.

‘The Practice of Eastern Catholic Theology’
International Conference of Pontifical Oriental Institute and Congregation for the Eastern Churches: ‘Identità di una missione future, tra il passato e presente’, Rome, 4 May 2017.

‘Liturgical Elements in the Oeuvre of Nikos Kazantzakis’
Short Communication at the 26th International Congress of the Societas Liturgica, Leuven, 11 August 2017.

‘Eine faszinierende Dialektik: Die Wechselwirkung zwischen Liturgie und Ökumene’,
International Conference of Institute for Liturgy, Christian Art and Hymnology, University of Graz, Graz, 5 May 2018.

‘Environmental Pollution, Eucharistic Ethos and Asceticism: An Orthodox and Ecumenical Perspective’
2018 Yale Liturgy Conference (‘Full of Your Glory: Liturgy, Cosmos, Creation’), Yale Institute of Sacred Music, New Haven, 20 June 2018.

‘Ex Oriente lux?: Beobachtungen zum Stellenwert der ostkirchlichen Liturgie’
Congress of the “Arbeitsgemeinschaft katholischer Liturgikdozentinnen und -dozenten im deutschen Sprachgebiet (AKL)”, Vienna, 3 September 2018.

‘Religions in Southeast Europe: Conservatism and Social Pluralism’
Conference of the Pro Oriente Commission for Southeast European History (‘From Tension to Conciliation: Intraregional and Interreligious Relations in Southeast Europe’), Vienna, 21 November 2018.

‘Interactive Web 2.0 and “Liturgy from the Bottom up”’ (in Greek)
Conference on ‘Theology and Liturgy: Contemporary Liturgical Research’, Aristotle University of Thessalonica, 9 May 2019.

‘The Strained Relationship between Venerating Old Testament Saints and Singing Anti-Jewish Hymns in the Byzantine Rite’
Conference on ‘The Byzantine Liturgy and the Jews’, Institute of Ecumenical Research, University of Sibiu, 9 July 2019.

‘Consecration of Chrism: Symbol of Ecclesial Unity?’
Conference on ‘Contemporary Orthodox Ecclesiology: Theological Foundations of Church Unity’, St. Philaret’s Orthodox Christian Institute, 30 March 2021.

‘Contrite Prayer and Penitent Weeping in the Byzantine-Greek Tradition’
Conference on ‘Praying with Tears in Eastern Christianity’, Yale Institute of Sacred Music, New Haven, 3 March 2023.

‘Christian Footprints of Asceticism: Saviours of God’,
‘100 Years of Askitiki: The Centenary Conference’, Queens’ College, Cambridge, 1 July 2023.


Talks (selection)

‘The Anointing of the Sick in Greece’ (in Dutch)
“Dutch Society of Liturgical Studies”, ’s-Hertogenbosch, 7 October 1987.

‘The Relation between Christianity and Islam in the Middle East’ (in Dutch)
Catechesis House and Liturgy Foundation, Amsterdam, 28 November 1989.

‘Das Zeitalter der Kaiserin Theophano († 991)’
Priests of the Kleve Deanery, Diocese of Münster, Kleve, 3 June 1991.

‘Visible Religion: Icons – Audible Religion: Byzantine Church Music – Tangible, Smelling and Tasty Religion: Incense, Oils, and Unguents in Byzantine Liturgy’ (in Dutch)
Open Science Day, University of Nijmegen, 6 October 1991.

‘Great Lent and Easter in the Orthodox Churches’ (in Dutch)
Nijmegen Byzantine Choir, Nijmegen, 17 March 1992.

‘God and Humankind Upside Down: The Christmas Icon’ (in Dutch)
Open Science Day, University of Nijmegen, 11 October 1992.

‘The Establishment of the Institute of Eastern Christian Studies’
Conference of the “Commission Oecuménique Internationale de l’Assomption” (Congregation of the Assumptionists), Frascati (near Rome), 26 August 1993.

‘The Byzantine Service Books for the Choir’ (in Dutch)
Symposium of the Institute of Eastern Christian Studies on Byzantine-rite church music, Nijmegen, 14 January 1995.

‘Η Ορθοδοξία στην Ελλάδα σήμερα: λατρεία, εκκλησιαστικές, δομές εντάσεις και προβλήματα’ (‘Orthodoxy in Present-Day Greece: Liturgy, Ecclesiastical Structures, Tensions and Problems’)
A.A. Foundation of Byzantine Studies, Hernen (near Nijmegen), 24 February and 20 April 1996.

‘Eastern Orthodoxy in the Balkans, Nationalism, and Reconciliation’
Second European Ecumenical Assembly, Graz, 28 June 1997.

‘Ökumenischer Gottesdienst, eucharistische Kommunion und die Orthodoxe Kirche’, Faculty of Catholic Theology, University of Graz, 21 January 1999.

‘Das Fest der Darstellung des Herrn: Struktur und Theologie dieses Festes im byzantinischen und im römischen Ritus’
Faculty of Catholic Theology, University of Vienna, 17 May 1999.

‘The Experience of Time in Orthodox Liturgy and Theology’ (in Dutch)
Open Science Day, University of Nijmegen, 10 October 1999.

‘Contemporary Perspectives on the Ecumenical Dialogue between the Orthodox and Roman Catholic Churches’
Institute of Ecumenical Studies, Charles University Prague, 17 November 2000.

‘Religious Rites in Eastern Europe’ (in Dutch)
A.A. Bredius Foundation, Hernen, 29 September 2001.

‘Theology of Icons and Iconoclasm’ (in Dutch)
Friends of Orthodox Art Foundation, Hernen, 30 September 2001.

‘Liturgie feiern mit Jugendlichen: Spannung zwischen Vergangenheit und Gegenwart sowie zwischen Norm und Freiheit’
Liturgical Conference of the Diocese of Graz-Seckau, Seggau Castle, Styria, 28 February and 1 March 2003.

‘Die Liturgie der orthodoxen Karwoche und Osternacht’
Urania Education Center Graz, and Chersonisos, Crete, 24 and 26 May 2003.

‘Entfremdung und Konflikte: Die Ursachen des Schismas zwischen Rom und Konstantinopel’
Urania Education Center, Graz, 8 October 2003.

‘“Rette, Herr, Dein Volk”: Nationalismus und der Beitrag der Orthodoxie für Frieden und Versöhnung’
Urania Education Center, Graz, 29 October 2003.

‘Die Feiergestalt der Eucharistie’
Symposium of the Faculty of Catholic Theology “Eucharistie: Gestern – heute – morgen”, Graz, 20 November 2003.

‘Tätige Teilnahme an der Liturgie heute’
Symposium of the Institute for Liturgy, Christian Art and Hymnology on “Catholic Liturgy Forty Years after the Promulgation of the Vatican II Constitution on the Sacred Liturgy”, University of Graz, 16 January 2004.

‘Liturgie mit Kindern, Familien und Jugendlichen’
Education Center of the Diocese of St. Pölten, 28 February 2004.

‘Die Krankensalbung und ihr Platz in der heutigen Krankenhausseelsorge’
Mariatrost Education Center of the Diocese of Graz-Seckau, Graz, 23 March 2004.

‘Die Beziehungen zwischen der Römisch-Katholischen Kirche und der Orthodoxen Kirche’, Ecumenical Pro Oriente Foundation, Graz, 24 March 2004.

‘Die Volkssprache in der Liturgie: Chancen und Probleme’
Inaugural Lecture, University of Graz, 11 May 2004.

‘Der Ökumenische Patriarch Bartholomaios’
Laudatory Speech at the conferment of the honorary doctorate of theology to the Ecumenical Patriarch of Constantinople, His Holiness Bartholomew I, University of Graz, 18 June 2004.

‘Worldwide Eastern Christianity’
Faculty of Orthodox Theology, University of Sibiu, Romania, 28 October 2004.

‘Lies in Inter-Religious Dialogue’
Conference of the UNESCO Chair-holders for Intercultural and Interreligious Dialogue, University of Bucharest, 29 October 2004.

‘Die Liturgie und die Reformation’
Protestant Redeemer Church, Graz, 31 October 2004 (Reformation Day).

‘“Vor Dir will ich spielen und singen”: Liturgie als Lebensquelle’
Annual Symposium of the Austrian Religious Orders, Vienna, 24 November 2004.

‘Gott und Gewalt in Südost-Europa: Liturgische und Ökumenische Aspekte’
University of Graz, Graz, 2 December 2004.

‘Der Akathistos-Hymnos’
Diocesan Priests’ Seminary, Graz, 7 December 2004.

‘Das Gebet mit Kranken in unserer Zeit und seine unterschiedlichen Feierformen’
Liturgical Conference of the Diocese of Graz-Seckau, Seggau Castle Education Center, 11 and 12 March 2005.

‘Begegnung mit dem Heiligen: Mit allen Sinnen christliche Liturgie feiern’
Conference for Religious Education Teachers, St Martin Education Center Graz, 16 March 2005.

‘Die unterschiedlichen Liturgiekonzepte in der Evangelischen, der Katholischen und der Orthodoxen Kirche’
Academy of Religious Education of the Archdiocese of Vienna and Academy of Religious Education of the Protestant Church, Course on Ecumenism, 5 April 2005.

‘Sonntagsgottesdienste mit oder ohne Priester?’
Deanery of Leibnitz, Seggau Castle Education Center, 10 May 2005.

‘Religion und Gewalt: Fallstudie Südosteuropa’
Global Studies, University of Graz, 25 May 2005.

‘Slowakei: Liturgische und ökumenische Aspekte’
Guest lecture at the invitation of the Faculties of Catholic Theology in Spišska Kapitula and Košice, Spišska Kapitula, Slovakia, 3 June 2005.

‘Les icônes et la liturgie’
13th International Ecumenical Conference “Andrei Rublev and the Russian Icon”, Monastery of Bose (in cooperation with the Patriarchate of Moscow), Bose, northern Italy, 17 September 2005.

‘Liturgical Language’
Guest lecture at the Faculty of Orthodox Theology, University of Belgrade, Serbia, 24 October 2005.

‘Heiligkeit der Liturgie’
Diocesan Liturgical Commission, Graz, 15 March 2006.

‘Klage in der Liturgie’
Workshop of the Pastoral Ministry Office, Diocese of Graz-Seckau, Graz, 18 March 2006.

‘Die Stellung des Bildes in der Ostkirche’
Symposium on the occasion of the 75th birthday of Prof. Dr. Philipp Harnoncourt, Graz, 24 March 2006.

‘Die neunte Vollversammlung des Ökumenischen Rates der Kirchen in Porto Alegre, Brasilien’
Pro Oriente Foundation and Faculty of Catholic Theology, University of Vienna, Vienna, 28 April 2006 (with Brigitte Proksch).

‘Ekklesiologie und Liturgie während der neunten Vollversammlung des Ökumenischen Rates der Kirchen in Porto Alegre, Brasilien’
Protestant Redeemer Church Graz, 10 May 2006.

‘Gottesdienst feiern in Krankenhäusern und Pflegeheimen’
Ecumenical and liturgical conference, Mariatrost Education Center, Graz, 12-13 June 2006.

‘Die ökumenischen Einrichtungen im 20. Jahrhundert (ÖRK, KEK usw.)’
2006-07 course on ecumenism, Cardinal König Academy, Vienna, 23 September 2006.

‘Wallfahrten im Judentum, Christentum und Islam’
2006 Symposium on Pilgrimage, Austrian Liturgical Committee, Salzburg, 25 September 2006.

‘Diakonie der Liturgie: Die Aufgaben von Diakonen im Gottesdienst’
Deacons’ Conference, Diocese of Gurk-Klagenfurt, St Georgen am Längsee (Carinthia), 30 September 2006.

‘Die eine Sonntagseucharistie und die pluriforme Pfarrgemeinde’
Conference of the Archdiocese of Vienna, Klosterneuburg Abbey, 14 October 2006.

‘Kult und Kultur: Christliches Feiern als Quelle gemeinsamen Lebens’
Conference of the Archdiocese of Vienna, Vienna, 20 October 2006.

‘Liturgie mit “Fernstehenden”’
Study Day of the Institute of Pastoral Theology and Pastoral Psychology, and the Institute for Liturgy, Christian Art and Hymnology, University of Graz, Graz, 7 November 2006.

‘Liturgie und Armut: Der Gottesdienst vor und nach dem Gottesdienst’
Series of public lectures on poverty in the first semester of 2006/07, University of Graz, 14 December 2006.

‘Religiöse Rituale in der Schule’
Institute of Religious Education of the Archdiocese of Vienna, Vienna, 8 January 2007.

‘Zum heutigen Stand des ökumenischen Ost-West-Dialoges’
Institute of Slavonic Studies, University of Bamberg, Bamberg, 27 January 2007 (paper read in my absence).

‘Marienverehrung in Ost und West’
Institute of History, Institute of Art History, Institute for Liturgy, Christian Art and Hymnology, University of Graz, Graz, 27 March 2007.

‘Die Eucharistie in katholischer und ökumenischer Perspektive’
2006/07 course on ecumenism, Cardinal König House, Vienna, 14 April 2007.

‘Theological Education in Austria and Possible Exchange with Bulgaria’
Faculty of Orthodox Theology, University of Veliko Trnăvo, Bulgaria, 4 May 2007.

‘Liturgie heute’
Institute of Practical Theology, University of Vienna, 8 May 2007.

‘Judentum, östliches und westliches Christentum und Islam: Kontakte, Dialog und Konfrontation’
Pro Oriente Foundation, Graz, 1 June 2007.

‘Grigorios Larentzakis: Laudatio’
Institute of Ecumenism, Eastern Orthodoxy and Patristic Studies, University of Graz, 28 June 2007.

‘Der griechische Schriftsteller Nikos Kazantzakis: Leben, Werk und Stellenwert’
Moser Bookstore, Graz, 20 October 2007.

‘Liturgie mit Kranken und Sterbenden’
Talk to Hospital Chaplains of the Archdiocese of Vienna, General Hospital (AKH), Vienna, 26 November 2007.

‘Liturgie und Ökumene: Unterschiedliche Liturgiekonzepte in den christlichen Kirchen’, Ecclesiastical Pedagogical Academy, Vienna, 18 November 2008.

‘Klage und Protest im Umgang mit Verlust und Trauer: Einige rituell-liturgische Aspekte’, Cardinal König House, Vienna, 12 December 2008.

‘“Nicht Du trägst die Wurzel, sondern die Wurzel trägt dich” (Röm 11,18): Antijudaismus in der christlichen Liturgie und Versuche seiner Überwindung’
Catholic Theological University of Linz, 15 January 2009.

‘Katholische Kirche und Judentum: Die Karfreitagsfürbitte’
Faculty of Catholic Theology, University of Graz, 4 March 2009.

‘Die eucharistische Prozession und das Herz-Jesu-Fest’
Sacred Heart Parish, Graz, 29 April 2009.

‘Christianity, Islam, and Judaism in the Balkans: Challenges for Interfaith Relations’ Conference of the UNESCO Chair-holders for Intercultural and Interreligious Dialogue, University of Oregon, Eugene, USA, 8 May 2009.

‘Intercultural and Inter-Faith Dialogue in the Balkans’
School of Theology and Ministry, Seattle University, USA, 14 May 2009.

‘Bulgarien: Kirchliche und gesellschaftliche Umbrüche seit 1989’
First Salzburg Cardinal König Symposium 1989-2009: ‘20 Years After the 1989 Turning-Point, Ecclesiastical and Social Developments in Eastern Europe’, St Virgil Education Center of the Archdiocese of Salzburg, Salzburg, 29 May 2009.

‘Der griechische Schriftsteller Nikos Kazantzakis und seine philosophisch-mystische Programmschrift Asketik, Salvatores Dei’

Austrian Society of Literature (in cooperation with the International Society of Friends of Nikos Kazantzakis, and the Greek Embassy), Vienna, 18 June 2009.

‘Die Göttliche Liturgie, kirchliches Leben und Feste in der Orthodoxen Kirche’
Course on Eastern Churches, ‘Theologische Kurse Wien’, Graz, 9 October 2009.

‘Religion am Balkan: Situation sowie ökumenische und interreligiöse Beziehungen’ University of Graz, 15 October 2009.

‘Men’s Liturgy, Women’s Liturgy and Then?: Observations and Suggestions Concerning a Christian Liturgy Which Does Justice to Gender’
Liturgy Symposium Series, Institute of Sacred Music, Yale University, New Haven, USA, 1 March 2010.

‘‘Heaven on Earth’: Constantinople and Byzantine Liturgy’ (in Dutch)
Conference on the history of the city of Istanbul, A.A. Bredius Foundation of Byzantine Studies, Hernen (near Nijmegen), 25 April 2010.

‘Catholic Liturgy in Present-Day Bavaria’
Talk to the participants of the Germany study trip of the Yale Institute of Sacred Music, Munich, 12 May 2010.

‘Liturgie und Sprache’
Deanery of Mürzzuschlag, Neuberg (Styria), 18 May 2010.

‘Interreligiöse, ökumenische und interkulturelle Beziehungen am Balkan’
Second Styrian UNESCO Day, Graz, 22 June 2010.

‘Geschichte, Praxis und Bedeutung der ostkirchlichen Liturgie’
St. Virgil Formation Academy, Pro Oriente Foundation Salzburg, Catholic Archdiocese of Salzburg, Salzburg, 5 November 2010.

‘Nur die Liebe zählt? Rituale und Liturgien im Kontext neuer Lebensformen’ (with Peter Ebenbauer)
Workshop at the Practical Theological Symposium “Ohnmacht, Sehnsucht und Ekstase: Gott und die Lebensformen des 21. Jahrhunderts”, University of Graz, Graz, 8 November 2010.

‘The Status of Papacy in the Catholic Liturgy and Popular Religious Culture after the First Vatican Council’
7th Session of the Saint Irenaeus Joint Orthodox-Catholic Working Group, Magdeburg, 18 November 2010.

‘Debate on a Common Easter Date: A Catholic and Ecumenical Perspective’
International Conference on Catholic-Orthodox Relations, Amsterdam, 6 December 2010.

‘Religion in Present-Day Greece’
Yale Institute of Sacred Music, New Haven, USA, 30 November 2011.

‘Worship Language: Finding the Right Words Today’
Overseas Ministries Study Center, New Haven, 17 February 2012.

‘Die konziliare Liturgiereform zwischen Aufbruch und später Ernüchterung’
Wiener Theologische Kurse, Vienna, 12-13 October 2012.

‘Η λατρεία στις ανατολικές και δυτικές παραδόσείς σήμερα: Προοπτικές και προβλήματα’, (‘Liturgy in the Eastern and Western Christian Traditions Today: Perspectives and Challenges’)
University Ecclesiastical Academy Thessaloniki, Thessaloniki, 20 February 2013.

‘Liturgy and Sacred Music: An Autobiographical Perspective’
Indian Orthodox Major Seminary, Kottayam, India, 25 February 2013.

‘Adäquate Gestalten der Liturgiesprache’
‘Fürbitten und Gebete’
‘Historische und ökumenische Perspektiven in Bezug auf die Liturgiesprache’
Three lectures delivered at the Annual Liturgical Symposium of the Diocese of Graz-Seckau, Seggauberg, 15-16 March 2013.

‘Das Zusammenspiel zwischen Liturgie, Sakralkunst und Sakralmusik in den Ostkirchen’
‘Long Night of the Churches’, Pro Oriente Graz, 24 May 2013.

‘Neue Formen der Liturgie angesichts weniger werdender Eucharistiefeiern’
Lainz Discussion Group, Vienna, 26 May 2013.

‘“A Tale of Three Cities”: Jerusalem, Konstantinopel und Rom’
Institute of Ethnology and Cultural Anthropology, University of Graz, 28 November 2013.

‘La lingua liturgica e i linguaggi popolari nelle Chiese Orientali: Possibilità e sfide’
Public lecture as holder of ‘The Sir Daniel and Countess Bernardine Murphy Donohue Chair of Eastern Catholic Theology at Pontifical Oriental Institute’, Rome, 6 March 2014.

‘Fremd und offen zum neuen wir’
Catholic Women’s Association Austria, Halbenrain, 21 February 2015.

‘Religious and Cultural Pluralism, as well as Peaceful Coexistence, in the Middle East: Some Observations’
International conference on ‘Religious and Cultural Pluralism, as well as Peaceful Coexistence, in the Middle East’, organized by the Greek Ministry of Foreign Affairs, Athens, 19 October 2015.

‘Nikos Kazantzakis, die Asketik und die Griechische Passion’
Moser Bookstore Graz, 10 March 2016.

‘‘Das Jubiläumjahr der Barmherzigkeit’: Einige liturgietheologische Aspekte’
Public lecture at the Faculty of Catholic Theology, University of Graz, Graz, 3 May 2016.

‘Migration, Refugee Crises and Terrorism as Challenges for Intercultural and Interreligious Dialogues’

Short communication during the Forum of UNESCO Chairs for Intercultural and Interreligious Dialogue in Southeastern Europe, Fourth World Conference on Dialogue among Religions and Civilizations, Bitola, Republic of North Macedonia, 4 November 2016.

‘The Byzantine Liturgy: Heaven on Earth?’ (in Dutch)
Public lecture during the 25th anniversary feast of the Institute of Eastern Christian Studies, Nijmegen, 2 December 2016.

‘Eastern Liturgy in the West: The Challenge of Inculturation and Ressourcement’ (in Dutch)
Public lecture given at a conference on liturgical traditions, Faculty of Catholic Theology, Tilburg University, 24 March 2017.

‘The Concept of “Tradition” with Respect to Liturgy during the Second Vatican Council’
Workshop on ‘Ancestral Traditions’ (Orientalium Ecclesiarum, no. 6): Status Quaestionis, Problems, Challenges, Congregation for the Eastern Churches, Vatican City, 12 June 2017.

‘Nikos Kazantzakis in the Netherlands’ (in Dutch)
University of Amsterdam, 25 October 2017.

‘Die Geschichte der Orthodoxen Kirche Griechenlands 1821-2018’
‘Die Liturgie und die religiöse Volkskultur in Griechenland’
‘Ikonographie und Kirchenarchitektur in Griechenland’
Three lectures for Wiener Theologische Kurse, Vienna, 13 January 2018.

‘Die orthodoxen Kirchen Südosteuropas und “Europa”’
Center for Southeast European Studies, University of Graz, 14 June 2018.

‘Die große und die kleine Wasserweihe in der orthodoxen Tradition’
Conference of the Austrian Liturgical Committee, Salzburg, 9 October 2018.

‘Die Fremdbestäubung zwischen dem byzantinischen und dem römischen Ritus: Einige Beispiele’
Symposium on exchange between Eastern and Western Christian traditions, University of Vienna, 12 October 2018.

‘Jesus und die Frauen’
Talk for Catholic Women Movement, Southeast Styria section, Halbenrain, 9 January 2019.

‘Der Balkan, “Europa” und die ökumenischen und interreligiösen Beziehungen in Bulgarien, Griechenland und Nord-Mazedonien’
King Abdullah International Center for Intercultural and Interreligious Dialogue, Vienna, 23 May 2019.

‘Odysseus/Ulysses According to Homer, Dante and Kazantzakis’
PhD Program of Southeast European Studies, University of Graz, 3 June 2019.

‘The Anointing of the Sick: Conciliar Reform and Post-Conciliar Practice’
St. Bede Lecture, Liturgical Institute at Ealing Abbey and Farnborough Abbey, London, 6 July 2019.

‘Fitting Liturgical Language: Some Criteria’
St. Philaret’s Christian Orthodox Institute and St. Thomas Catholic Institute, Moscow, 5 December 2019 (Skype presentation).

‘Cardinal Johannes Willebrands and Ecumenism: A St Vitus’ Procession’ (in Dutch)
Symposium on the cardinal’s life and work, The Hague, 24 January 2021 (Zoom presentation).

‘Anti-Judaism in the Christian Liturgy: A Stumbling-Block in Genuine Worship’
‘Liturgy Seminar’, Toronto School of Theology, University of Toronto, Toronto, 14 April 2021 (Zoom presentation).

‘Gold and Liturgy’
Seminar on ‘Extractivismos y Teología Litúrgica’ of the ‘Teologías, Ecologías y Extractivismos’ working group, 27 April 2021 (Zoom presentation).

‘Orthodox Liturgy in the West: Various Observations on Sacred Architecture, Ecumenism and the Veneration of Saints’
“Studia Theologica Doctoralia” International Symposium, 12th-13th edition, Jassy, 10 May 2021 (Zoom presentation)

‘Nikos Kazantzakis and the Greek Orthodox Tradition’
Academy of Theological Studies of the Holy Metropolis of Demetrias (Volos), 7 June 2021 (Zoom presentation)

 ‘Fascinating Dialectics: The Interplay of Liturgy and Ecumenism’
Keynote Lecture at the International Summer School, Pro Oriente Foundation, Vienna, 4 July 2022.

 ‘Synodalität und Primat: Pespektiven aus dem katholisch-orthodox theologischen Dialog’
(together with Andrea Riedl) Faculty of Catholic Theology, University of Graz, 19 January 2023.

 ‘Οι λαϊκές αντιλήψεις περί του ευχελαίου και η σχετική λειτουργική πράξη στον Ελλαδικό χώρο’ [about my Greek fieldwork on the anointing of the sick]
7th Annual Lecture in Memory of Professor Ioannis Foundoulis, Faculty of Theology, Aristotle University of Thessalonica, Thessalonica, 13 February 2023.

 ‘Byzantine-Rite Liturgical Books’
Yale Divinity School and Yale Institute of Sacred Music, New Haven, 9 March 2023.

 ‘Praying with Icons’
Ealing Abbey, London, 9 July 2023.