Mechanical Engineer with a PhD (1988), MSc (1985) in thermal sciences from Georgia Institute of Technology, and BSc (1984) in energy from Michigan Technological University. Leader of Group Energy Conservation at IERSD-NOA since 1995. Research interests in the areas of energy conservation and high performance buildings, energy audits and refurbishment, solar thermal and cooling applications, analysis and numerical modeling of thermal energy systems, indoor environmental quality, HVAC systems. Instrumental in the development of the technical guidelines and the national regulation on the energy performance of buildings (KENAK) for EPBD transposition in Greece. Editorial Board member in Energy & Buildings and Sustainable Cities & Society. ASHRAE Vice President (2011-2013) & Director At Large (2007-2010), Technical Chamber of Greece (Chartered Mechanical Engineer), EUR ING, Fellow ASME, Fellow ASHRAE.