1985-..

Director, Internal Combustion Engines Laboratory

1992-..

Full Professor, Thermal Engineering Section, Mechanical Engineering Department, N.T.U.A.

1995-99 & 2004-06

Head of Thermal Engineering Department, Mechanical Engineering Department, N.T.U.A.

1998-2008

Vice-Scientific Responsible and Vice-Director of the Interdepartmental Postgraduate Program Studies "Energy Production and Management" of the N.T.U.A.

2006-2010

President of the Senatorial Advisory Board for the N.T.U.A. Laboratories

2007-2009

President (Dean) of the School of Mechanical Engineering of the N.T.U.A.

2009-10

Head of the Thermal Engineering Department, School of Mechanical Engineering, N.T.U.A.