G. Rozenberg either founded or co-founded and/or was the Chair of the following conferences: International Conference on Developments in Language Theory, International Conference on Graph Transformation, International Conference on Unconventional Computation, International Conference on Theory and Applications of Petri Nets, and the International Meeting on DNA Computing.
Rozenberg was president of the European Association for Theoretical Computer Science from 1985 to 1994 (the longest term in that position) and the editor of the Bulletin of the European Association for Theoretical Computer Science from 1980 until 2003 [REF].