He is Professor and UNESCO Chairholder on Green Innovation and Circular Economy  at the NTUA (National Technical University of Athens) and Professor at the ATHENS  MBA (NTUA – Athens University of Economics) since 1997. He is the coordinator of the  “Environmental Economics and Sustainable Development Research Group” of the  Sector of Industrial Management and Operations Research of the Mechanical  Engineering School. 

He was also a visiting professor at Imperial College – University of London and a  research associate at the Earth Engineering Center of Columbia University – USA.  

He was Secretary General for Forestry, from 2/2022 to 7/2023, at the Greek Ministry  of Environment and Energy. Prior to that, he was also Secretary General of Natural  Environment & Water. 

He is a Mechanical Engineer (Aachen University of Technology – Germany) with an MSc  in Management Science from Imperial College and a Phd from NTUA. 

He was an advisor to the Minister of Culture, on the Olympic Games projects, and their  post-Olympic use. 

He has been President of the Greek Association of Environmental Protection  Companies (PASEPE), President of the Hellenic Solid Waste Management Association  (HSWMA) (now Hon. President), President of the Ordinary Environmental Committee  of the Technical Chamber of Greece, President of the Greek Branch of the Waste to  Energy Research and Technology Council, coordinated by Columbia University and  Member of Evaluation Committees for Investment and Energy Projects of the Ministry  of Development. Furthermore, he has been Member of the Board of the Organization of Labour Residencies (OEK) and General Manager of Environmental Companies. 

He has extensive research experience (as a coordinator or project team member of  European Programmes) in investment management and evaluation, operational  research and environmental investment analysis. 

He was co-founder and main organizer of the largest national volunteer campaign  (45.000 volunteers) LETS DO IT GREECE where the whole country is cleaned in one day  with symbolic character in the framework of the international campaign LETS DO IT  WORLD. 

He has organized 14 International Conferences and has authored books and more than  100 publications in international scientific journals and proceedings of International  Conferences while coordinating many national and international research projects.