1. 1980-83       Member of AIAA institute

2. 1985-,          Member of Yugoslav Heat Engineering Society

3. 1998-2003   Active Member of New York Academy of Sciences

4. 2000-           Member of American Society  of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE)

5. 2002-2003   Member of American Society of mechanical Engineers (ASME)

6. 2003-         Member of International Building Performance Simulation Association (IBPSA)-USA