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- "The Futures of Pentecostalism in Europe". Conference of the European Pentecostal Theological Association, Kniebis, Germany, 30 April - 2 May 2009.
- "Toward a Theology and Praxis of Reconciliation among the nations: A Pentecostal perspective on the making of Europe in the 21st Century". European Research Network on Global Pentecostalism: Transnational Pentecostalism in Europe. Fourth GloPent Conference, 6-7 February 2009, Selly Oak, Birmingham, UK (Facilitated by the Centre for Pentecostal and Charismatic Studies, University of Birmingham).
- "Revisiting Evangelicalism and Ecumenism within Pentecostal Theological Education". Conference of the European Pentecostal Theological Association, Warsaw, Poland, 10-12 May 2007.
- "Le défi œcuménique des Eglises et missions pentecôtistes". Enjeux et perspectives pour la mission en ce début de 3e millénaire : Entre la mondialisation et les résurgences des réflexes identitaires. Symposium organised by the Institut évangélique de missiologie, St-Légier, Switzerland, April 2-6, 2002.
- "Pentecostalism and Ecumenism: A Critical Examination of Seeming Antipodes". 31st Annual Meeting of the Society for Pentecostal Studies, March 14-16, 2002, Southeastern College, Lakeland, Florida, U.S.A.
- "Pentecostalism and Ecumenism in France: A Critical Examination of Seeming Antipodes". 10th Conference of the European Pentecostal Charismatic Research Association, July 17 - 21, 2001, Catholic University of Leuven, Belgium.
- "Einblick in die weltweite Pfingstbewegung: Erfahrungen und Praktische Arbeit mit Pfingstbewegungen und Charismatische Bewegungen." (A Look at the Worldwide Pentecostal Movement: Experiences and Practical Work with Pentecostal Churches and Charismatic Movements). Colloquium of the Vereinte Evangelische Mission, April 3, 2001, Wuppertal, Germany.
- "Die Ökumenische Herausforderung der Pfingstbewegung für die Reformierte Kirche in Deutschland" (The Ecumenical Challenge of Pentecostalism for the Reformed Church in Germany). Annual Colloquium of the Reformed Pastors in Northern Germany, October 9, 2000, Hannover, Germany.
- "Pratiques missionnaires pentecôtistes et œcuménisme: Récit d'expérience d'un théologien pentecôtiste" (Pentecostal Mission Praxis and Ecumenism: Recalling the Journey of a Pentecostal Theologian), Colloque: Oecuménisme et pratiques missionnaires (1948-2000), Centre Vincent Lebbe and Centre de Recherche et d' Echanges sur la Diffusion et l' Inculturation du Christianisme (CREDIC), August 27-31, 2000, Faculté de théologie, Louvain-la-Neuve, Belgium.
- "L'Eglise du 21ème siècle sera-t-elle pentecôtiste ? Le défi lancé par les mouvements pentecôtistes et charismatiques à la mission de l'Eglise: un point de vue pentecôtiste français" (Will the Church of the 21st Century be Pentecostal ? The Pentecostal and Charismatic Movements and their Challenge to the Mission of the Church: a French Pentecostal Point of View), Assemblée Générale de l'Association Francophone Oecuménique de Missiologie (AFOM), Mission et mouvements de l ' Esprit, May 26-27, 2000, Paris, France.
- "Les Assemblées de Dieu en Alsace: une expression classique du pentecôtisme français" (The Assemblies of God in Alsace: a classical expression of French Pentecostalism), Journée d'études Actualités des protestantismes évangéliques, March 25, 2000, Centre National de Recherche Scientifique (CNRS) «Société, Droit et Religion en Europe», Palais Universitaire, Strasbourg, France.
- "The Ecumenical Challenge of Pentecostal Missions: A European Pentecostal Perspective for the 21st Century", 29th Annual Meeting of the Society for Pentecostal Studies: Issues Home and Abroad at 2000, March 16-18, 2000, Plenary Session, Northwest College, Kirkland, WA., U.S.A.
- "Die ambulante Suchtkrankenhilfe und chronisch mehrfach beeinträchtigte alkoholkranke Menschen: Anders denken, um anders zu helfen" (The ambulant treatment of addiction and severely restricted, chronically ill alcohol addicts: a different way of thinking for a different way of helping), Conference on Addiction ' 99, German National Association Against the Dangers of Addiction, November 8-10, 1999, Weimar, Germany.
- "The Ecumenical Challenge of Pentecostal Churches", European Pentecostal/Charismatic Research Association, July 13 – 17, 1999, Academy of Mission at the University of Hamburg, Germany.
- "Der Heiligen Geist im Leben der Pfingstkirchen" (The Holy Spirit in the life of the Pentecostal Churches), St. Ansgar-Week (30 - 31 January 1998), Katholische Akademie, Hamburg, Germany.
- "Auf dem Wege zu einem gemeinsamen Verständnis von Mission: Bericht über einen Prozess innerhalb der ACKH" (Towards a common understanding of Mission: Reflections upon the work of the Theological Committee of the Council of Christian Churches of Hamburg), 3rd Ecumenical Forum "Churches and Charismatic Movements: Mission Profile(s) and Church Picture(s)" (27 - 29 October 1997), Academy of Mission at the University of Hamburg, Germany.
- "La place des oeuvres et de leurs agents, clercs et laïcs, dans le champ religieux" (The role of charitable institutions and of their agents, clergymen and laymen, within the religious field), Round-table discussion Colloquy "Entre le public et le privé: conditions institutionnelles et sens de l'action caritative" (Between public and private service: institutional conditions and the meaning of charitableness) 7 - 8 March 1996, Centre de Sociologie des Religions, Faculté de Théologie Protestante, Université Marc Bloch de Strasbourg, France.
- "Neue Gemeinden aus der Sicht eines pfingstkirchlichen Theologen" (Church Planting from a Pentecostal Viewpoint) 2nd Ecumenical Forum "State Church and Charismatic Movements" (29 November - 1 December 1995), Academy of Mission at the University of Hamburg, Germany.
- "Fundamentalismus und die charismatische Bewegung" (Fundamentalism and the Charismatic Movement), Ecumenical Forum "State Church and Charismatic Movements" (10 - 12 October 1994), Academy of Mission at the University of Hamburg, Germany.
- "Fundamentalismus im Christentum: Begriffe, Geschichte und charakteristische Grundzüge" (Fundamentalism in Christianity: Terminology, History, and Characteristics), Advent-Gemeinde Grindelberg (Seventh-day Adventist), Hamburg, Germany (October 1993).
- "Fundamentalismus unter dem Aspekt pfingstlerischer Theologie" (A Pentecostal View of Fundamentalism), 20th Ecumenical and Theological Seminar, Hauptkirche St. Petri (Lutheran Church), Hamburg, Germany (January 1993).
- "Die Pfingstkirchen: Verfälschung oder Richtigstellung?" (Pentecostalism: Distortion or Correction?) Evangelische Akademie Nordelbien, Ecumenical Committee of the Evangelical Lutheran Church Board, Bad Segeberg, Germany (March 1992).
- "Some Reflections on Social Ministry in European Pentecostal Churches: Three Study Cases", 6th Conference on Pentecostal and Charismatic Research in Europe, Kappel a. Albis, Switzerland (July 1991).
- "Culture and Change: Pentecostalism in the Making in Alsace", 20th Annual Meeting of the Society for Pentecostal Studies, Dallas, Texas, U.S.A. (November 1990).
- "Finding the Will of God: Biblical Guidance within the Pentecostal Tradition", 12th Annual Conference European Pentecostal Theological Association, Hamar, Norway (July 1990).
- "Ermeneglossia and Orthopraxis: Is there a Way out of Confusion?" International Correspondence Institute Faculty Colloquium, Brussels, Belgium (October 1988).
- "Pentecostalism and Evangelicalism: Semantic Analysis and Relational Implications", International Conference for the Sociology of Religion, Tübingen, Germany (August 1987).
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