Hungarian Chemical Society (Vice Chairman from 2012, Deputy Secretary 2000-2012)
Chairman of IUPAC V.6 Commission on Equilibrium Data (1986-1998)
IUPAC Fellow (from 2000)
Member of the Presidency of the Hungarian Chemical Society (1990-1999)
Scientific Secretary of the Szeged Regional Committee of the Hungarian 
    Academy of Sciences (2000-2006)
Doctoral Representative of the Hungarian Academy of Sciences (2000-2006)
Member of Society of Biological Inorganic Chemistry (SBIC)
(from 1996)
Member of the American Chemical Society (from 1996)
Fellow of the Royal Society of Chemistry
(from 1996)

Journal Editorial Boards:
Hungarian Chemical Journal (Editor-in Chief from 2008)
European Journal of Inorganic Chemistry
Polyhedron (2000-2007)
Hungarian Journal of Chemistry (1998-2000)
Central European Journal of Chemistry (from 2001)
Journal of Inorganic Biochemistry

Reviewer at:
Journal of Inorganic Biochemistry, Inorganica Chimica Acta, European Journal of Inorganic Chemistry, Journal of Biological Inorganic Chemistry, Inorganic Chemistry, Polyhedron

Conference Advisory Boards:
Eurasia Conference
Member of the International Conference Applied Coordination Chemistry
    Advisory Board (from 1998)
Member of the International Conference on Vanadium Advisory Board (from 1994)

Organization of International Conferences:
COST-ESF Workshop on Biological and Medicinal Aspects of Metal Ion Speciation (Szeged, 1998)

5th International Symposium on the Interdisciplinary Regional Research Conference (Szeged, 2001)
4th International Vanadium Symposium (Szeged, Hungary, 2004)
Workshop on Metal Containing Drugs (Szeged, 2011)
4th European Conference on Chemistry for Life Sciences (Budapest, Hungary, 2011)
13th European Biological Inorganic Chemistry Conference EuroBIC 13 (Budapest, Hungary, 2016)