• 1972 – 1975

• Study of theology, philosophy and Modern Greek, University of Nijmegen, the Netherlands
• Member of the Faculty’s Advisory Council for Education
• 18 April 1976: Public defence of the bachelor thesis Gebedsgenezing: Bijbels fundament en huidige praktijk (‘Faith Healing: Biblical Foundation and Current Practice’), Amsterdam-Nijmegen 1976, 78 pp., University of Nijmegen, and bachelor examination in theology (summa cum laude). ‘Cand. Theol.’ (‘Candidate of Theology’)

• 1975 – 1980

• Study of practical theology in Amsterdam (Catholic Theological University of Amsterdam and School of [Protestant] Theology of the University of Amsterdam)
• Member of the University Council and the Committee for Scholarly Research
• Managing editor of the university’s internal periodical Katharsis
• Assistant of liturgical studies (1975-1976 and 1979)
• Clinical Pastoral Education in Amersfoort (March-April 1978) and pastoral internship in the ‘Elisabeth Gasthuis’ Hospital in Haarlem (September 1977 - January 1978)
• 15 February 1980: Public defence of the master thesis De viering van de ziekenzalving in een algemeen ziekenhuis (‘The Celebration of the Anointing of the Sick in a General Hospital’), Amsterdam 1980, VIII + 197 pp., Catholic Theological University of Amsterdam (summa cum laude). ‘Drs. Theol.’ (‘Master of Theology’)

• 1980 – 1981

• Research in Trier, Germany: Liturgical studies and history of art (School of Theology, Trier and German Liturgical Institute)
  Grantee of the Alexander von Humboldt-Foundation, Bonn
• Follow-up courses in Byzantine and Modern Greek at the University of Bonn

• 1981 – 1984

• Research in Thessalonica on Byzantine Orthodox liturgy, art and palaeography (Aristotle University and Patriarchal Institute for the Study of the Church Fathers)
• Field research in Thessalonica, Athens, on Mount Athos and in villages of Macedonia on rituals for the sick and dying
• Grantee of the Alexander von Humboldt-Foundation (4 months) and of the Greek Ministry of Education and Religious Affairs (3 years)

• 1984 – 1985

• Research in Nijmegen: Redacting and editing the results of the Greek field work
• Grantee of the Netherlands’ Organization for Scientific Research

• 1987 – 1991

• Junior lecturer at the University of Nijmegen (project financed by the University and the Congregation of the Assumptionists)
• Main task: Preparation of the foundation of a new academic institute, viz. the Institute of Eastern Christian Studies
• Activities:
• - Organization of teaching, research, faculty, staff and library
• - Acquisition of financial means and other financial affairs
• - Integration of the new institute within the university

• 16 January 1991

• Public defence of the dissertation ”Ter genezing van ziel en lichaam“: De viering van het oliesel in de Grieks-Orthodoxe Kerk (‘For the Healing of Soul and Body: The Celebration of the Anointing of the Sick in the Greek Orthodox Church’, see my list of publications) at the University of Nijmegen

• 15 November 1991

• Official inauguration of the Institute of Eastern Christian Studies

• 1991 – 1995

• Director of the Institute of Eastern Christian Studies
• Main tasks:
• - Management of the institute
• - Coordination of teaching and research
• - Publicity
• - Acquisition of financial means
• - Integration of the scholarly periodical Het Christelijk Oosten within the institute
• - Extension of the library

• 1995 – 2002

• Senior lecturer (research and teaching) at the University of Nijmegen and the Institute of Eastern Christian Studies
• Member of the editorial team of the periodical Het Christelijk Oosten, later (from 2002) entitled The Journal of Eastern Christian Studies;
• Editor-in-chief of The Journal of Eastern Christian Studies (2001-2002)
• Member of the editorial team of Eastern Christian Studies (series of monographs)
• Librarian of the Institute (1998-2002). Size of the library: about 30,000 volumes

• October 1996 – March 1998

• Visiting Professor of Eastern Christian Studies and Ecumenism at the School of Catholic Theology of the University of Munster, Germany

• November 1997 – May 1998

• Fellow of the Alexander von Humboldt-Foundation for research on ‘Nationalism in Southeastern European Orthodoxy’ at the University of Munster

• 2002 – 2018

• Full Professor of liturgical studies and sacramental theology at the University of Graz, Austria
• Director of the Institute for Liturgy, Christian Art and Hymnology at the University of Graz

• 2007 – 2019

• UNESCO Professor of Intercultural and Interreligious Dialogue in Southeastern Europe
• Member of the UNI-Twin network of UNESCO chairs for intercultural and interreligious dialogue
  
  
• Dean of Research and Vice-Dean of the School of Catholic Theology (October 2005-September 2007)
• Main tasks:
• - Coordination of research
• - Setting up new research programs
• - Management of the School of Catholic Theology (together with the Dean and the Dean of Students)

• Head of the Library Committee of the School of Theology (2003-2007)
• Main task: fusing fourteen autonomous libraries into one new Faculty library; organization of staff and finances
• 28 September 2008: Inauguration of the new library (size: about 150,000 volumes)

• Coordinator of the Chair-holders at the School of Theology (October 2013 – October 2017)
• Chairman of the University Courses Committee (December 2013 – December 2014)
  
  
• Head of the Graz section of the ecumenical Pro Oriente Foundation, Graz-Vienna (2005-2009) and member of the foundation’s board of governors in Vienna (2005-2017)
• Adviser of the Dutch Bishops’ Conference for ecumenism (2003-2012)

• March – September 2008

• Sabbatical stay in Rome: Research at Pontifical Oriental Institute and ‘Ateneo Sant’Anselmo’ (School of Theology and Pontifical Liturgical Institute)

• 2011 – 2012

• Senior Research Fellow and Visiting Professor of Liturgical Studies at Yale University, Institute of Sacred Music, New Haven, USA
• Guest Fellow of Branford College, Yale University
• Resident of Overseas Ministries Study Center, New Haven

• 2014 – present

• Visiting Professor at Pontifical Oriental Institute, Rome

• 2014

• ‘Sir Daniel and Countess Bernardine Murphy Donohue Chair of Eastern Catholic Theology at the Pontifical Oriental Institute’

• 2018 – present

• Professor Emeritus of liturgical studies and sacramental theology at the University of Graz

• 2018 – present

• Special Visiting Professor at Catholic University of Leuven, Belgium

• 2020 – present

• Visiting Professor at ‘Institutum Liturgicum’, St Benedict’s Abbey, Ealing (London) and St Michael’s Abbey, Farnborough"

Organization of International Conferences (selection)

The Empress Theophano, Byzantium and the West 950-1050, joint conference of the Institute of Eastern Christian Studies, the A.A. Bredius Foundation for Byzantine Studies, and the Institute of Byzantine and Modern Greek Studies of the University of Groningen, 30-31 May 1991, Hernen Castle near Nijmegen

Palästina im Laufe der Jahrhunderte, joint conference of the A.A. Bredius Foundation and the Institute of Byzantine Studies of the University of Munster, May 1992, Hernen Castle

Four Hundred Years Union of Brest (1596-1996): A Critical Re-evaluation, joint conference of the Institute of Eastern Christian Studies and the Interuniversity Institute for Missiological and Ecumenical Research (Utrecht) in cooperation with the A.A. Bredius Foundation and the University of Nijmegen, 28-30 March 1996, Hernen Castle

Réconciliation et conversion dans les églises orientales, l’islam et le judaïsme, organized together with the other members of the executive committee of the ‘Commission Oecuménique Internationale de l’Assomption’ (Congregation of the Assumptionists), 20-29 August 1999, Jerusalem

Liturgie und Trinität: Internationaler Kongress der Arbeitsgemeinschaft Katholischer Liturgiedozenten und –dozentinnen, organized together with other Austrian colleagues, 6-10 September 2004, Seggauberg near Graz

Second International Congress of the Society of Oriental Liturgy, organized together with some other members of the executive board of the Society of Oriental Liturgy, 17-21 September 2008, Rome

Fourth International Congress of the Society of Oriental Liturgy, organized together with another member of the executive board of the Society of Oriental Liturgy, 10-16 July 2012, University of Notre Dame at Louaize, Zouk Mosbeh (near Beirut) and University of Balamand (near Tripoli), Lebanon

Fifth International Congress of the Society of Oriental Liturgy (president), organized together with two other members of the executive board of the Society of Oriental Liturgy, 10-15 June 2014, Saint Vladimir’s Orthodox Theological Seminary, New York

Zukunftsraum Liturgie: Gottesdienst vor neuen Herausforderungen, organized with colleagues of the Institute for Liturgy, Christian Art and Hymnology, University of Graz, 3-5 May 2018, University of Graz

Ex Oriente lux ? Ostkirchliche Liturgien und westliche Kultur, International congress of the “Arbeitsgemeinschaft Katholischer Liturgiedozenten und –dozentinnen”, organized together with other Austrian colleagues, Vienna, 3-7 September 2018

Membership of Editorial and Academic Advisory Boards

Orientalia Christiana Analecta (Rome)
Österreichische Studien zur Liturgiewissenschaft und Sakramententheologie / Austrian Studies of Liturgy and Sacramental Theology (Vienna and Innsbruck)
Review of Ecumenical Studies (Sibiu)
Jaarboek voor Liturgie-onderzoek (Tilburg and Groningen)
The Journal of Eastern Christian Studies (Nijmegen and Leuven, 2003-2022)
Netherlands Studies in Ritual and Liturgy (Groningen, Tilburg and Amsterdam)
Eikonikon (Amsterdam, 2022-present: editor-in-chief)
Centre of Southeast European Studies, University of Graz
Pius-Parsch-Studien (Klosterneuburg)

Membership of Associations and Committees

Society of Oriental Liturgy (2012-2014: president; 2014-2016: past president; 2010-2012: vice-president; 2006-2010: Euro treasurer)
Societas Liturgica
North American Academy of Liturgy
Arbeitsgemeinschaft katholischer Liturgiedozenten und -dozentinnen im deutschen Sprachgebiet (2004-2014: chairman of the Austrian section)
Liturgiewissenschaftliche Gesellschaft Klosterneuburg
Verein zur Förderung der Christlichen Archäologie Österreichs
Genootschap voor Liturgiestudie (‘Dutch Society of Liturgical Studies’)
National Liturgical Committee of the Austrian Bishops’ Conference (2003-2023)
Diocesan Liturgical Committee, Diocese of Graz-Seckau

UNESCO / UNITWIN Network of Chairs for Intercultural and Interreligious Dialogue (2008-2014 regional European coordinator)
Austrian UNESCO Commission (2007-2019)

Societas Oecumenica
Ecumenical Pro Oriente Foundation, Vienna (head of the Graz section (2005-2009); theological expert and consulter)
Saint Irenaeus International Joint Catholic-Orthodox Theological Study Group (founding member)
Katholieke Vereniging voor Oecumene Athanasius en Willibrord (‘Dutch Catholic Association for the Promotion of Ecumenism’)
Ecumenical Forum of the Styrian Christian Churches (2004-2008)
Diocesan Ecumenical Committee, Diocese of Graz-Seckau (2004-2010)
Gesellschaft für das Studium des Christlichen Ostens (2004-2019)
Commission Oecuménique Internationale de l’Assomption (member of the executive committee, Congregation of the Assumptionists, 1993-2001)
Apostolaat voor de Oosterse Kerken / Actie en Ontmoeting Oosterse Kerken (‘Apostolic Care of Eastern Churches’) (member of the board of governors, 1986-1998)
Oost-West-Beraad (‘East-West Consultation: Advisory Committee of the Dutch Bishops’ Conference regarding Christianity in Eastern Europe’) (1989-2000)

European Society of Catholic Theology, Austrian section
Netherlands Research School for Theological and Religious Studies, NOSTER (1997-2002)

‘Humboldtians’: Alumni of the Alexander von Humboldt Foundation
Vereniging van Afgestudeerden van de Katholieke Theologische Universiteit (‘Association of Alumni of the Catholic Theological University’, Utrecht)

European Association for Modern Greek Studies, Austrian and Dutch sections
Association Internationale des Amis de Nikos Kazantzakis (member of the executive committee)
Association Internationale des Études Byzantines, Austrian section
A. A. Bredius Foundation of Byzantine Studies (1997-2018: member of the board of governors)
Christian-Jewish Society in Trier (1980-1981)
Styrian Christian-Jewish Committee (2002-2005: member of the executive board)
Afro-Asian Institute, Diocese of Graz-Seckau (2009-2015: member of the board of governors)

Katholiek Studiecentrum voor de geestelijke volksgezondheid (‘Catholic Centre for Public Mental Health’)
Pax Christi Internationalis, Dutch section (1985-2002), Austrian section (from 2003)

National Honor Society (top students at US American High Schools, 1971-1972)
Ranger School Club (Youth section of the World Wildlife Fund), Vught chapter (chairman and editor-in-chief, 1969-1971)
Nederlandse Jeugdbond ter Bestudering van de Geschiedenis (‘Dutch Youth Association of Historical Studies’), Vught chapter (chairman, 1969-1971)
Klassieke Luisterclub (‘Classical Music Association’) (chairman, 1969-1971)

Participation in the Eighth, Ninth and Tenth General Assemblies of the World Council of Churches, at Harare, Zimbabwe (1998), Porto Alegre, Brazil (2006) and Busan, South Korea (2013)
Participation in the Second and Third European Ecumenical Assemblies, at Graz, Austria (1997) and Sibiu, Romania (2007)
Numerous study trips throughout Southeastern Europe, the Middle East and elsewhere.