- European Association for the Study of Diabetes (EASD) Fellow Member of the Board 1984-87
- Diabetic Pregnancy Study Group (DPSG) of EASD Fellow member Chairman of the board 2004 – 2005
- International Society of Diabetic Pregnancy Study Groups (ISDPSG) Fellow member
- American Diabetes Association (ADA) Fellow member Organizing Committee – 5th International Workshop of the GDM of ADA, Chicago 2005
- International Diabetic Federation (IDF) Fellow member
- Mediterranean Group for the Study of Diabetes (MGSD) Fellow member
- Hellenic Diabetes Association (HAD) Fellow member
- Hellenic Endocrinological Society Fellow member
- Hellenic Association for Obesity, Metabolism and Endocrinological Disorders (HASHOMED) Chairman of the Board
Editorial Boards:
AD-HOC REVIEWER for peer-reviewed international journals
- Diabetes Care
- Diabetologia