Vol. 41., Mission series. Zoetermeer: Boekencentrum, Co-Supervisor at Utrecht University. Defense: June, 2007.
Vol. 46., Mission series. Zoetermeer: Boekencentrum, 2008. Co-Supervisor at Utrecht University. Defense: December, 2008.
Vol. 47., Mission series. Zoetermeer: Boekencentrum, 2009 – Co-Supervisor at Utrecht University. Defense: December, 2008.
Vol. 49., Mission series. Zoetermeer: Boekencentrum, 2009 – Co-Supervisor at Utrecht University. Defense: March, 2009.
KRE-HTK PhD program, external PhD student. (admitted June 2011)
Evangelical Theological Faculty, Leuven, Belgium, PhD student, Co-supervisor (admitted in September 2014)
KRE-HTK habilitation program. Defense: February, 2012.
(Between Accommodation, Affinity and Resistance: A historical Investigation of German Faith Missions During the Period of National Socialism), E. Spohn, University of South Africa, Department of Christian Spirituality, Church History and Missiology, February 2014 (in process).
András Harmathy, Bakke Graduate University, Seattle. May 2012.
Előd Szabó, Faculty of Theology, Károli Gáspár University of the Reformed Church in Hungary, June, 2010.
Gábor Lassú, Faculty of Theology, Károli Gáspár University of the Reformed Church in Hungary, December, 2009.
Sándor Gaál, Debrecen Reformed University of Divinity, April, 2005
András Lovas, Bakke Graduate University, Seattle, WA). May, 2006.