The 2nd International Conference on Numerical Analysis and Approximation Theory (Cluj-Napoca/Transilvania, September 23-26, 2010).

Romanian-German Symposium on Mathematics and its Applications (Sibiu/Transilvania, May 14-17, 2009), including the 9th Romanian-German Seminar on Approximation Theory and its Applications.

The 8th Romanian-German Seminar on Approximation Theory and its Applications (Sibiu/Transilvania, May 28 - June 1, 2008).

Bilateral Romanian-German Workshop on Approximation and Wavelets (Königswinter/Germany, October 1-4, 2007).

International Conference on Numerical Analysis and Approximation Theory (Cluj-Napoca/Transilvania, July 5-8, 2006).

The 6th Romanian-German Seminar on Approximation Theory and its Applications (Baisoara/Transilvania, June 3-6, 2004).

Minisymposium im Rahmen des Internationalen Kongresses der "Mathematical Society of Southeastern Europe" (Borovets/Bulgaria, September 15-21, 2003).

The 5th Romanian-German Seminar on Approximation Theory and its Applications (Sibiu/Transilvania, June 12-15, 2002).

The 4th Romanian-German Seminar on Approximation Theory and its Applications (Brasov/Transilvania, July 3-5, 2000).

The 3rd Romanian-German Seminar on Approximation Theory and its Applications (Sibiu/Transilvania, June 1-3, 1998).

The 2nd Romanian-German Seminar on Approximation Theory and its Applications (Cluj-Napoca/Transilvania, August 1996).

Foundation of the series of RoGer Seminars at the Technical University Cluj-Napoca (September 1994).

Zwischen 1990 und 1997 Organisation des Oberseminars Rhein-Ruhr und diverser Workshops über Angewandte Analysis, Approximationstheorie, CAGD und Numerische Mathematik an der European Business School, der FH Dortmund und in der Internationalen Bildungsstätte Willebadessen. Diese Tradition wird fortgeführt in Form der Rhein-Ruhr-Workshops.