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.

Research and Development in the areas of energy conservation, high performing buildings, thermal and solar building applications, building energy audits-diagnosis and retrofitting, national regulations - technical guidelines – software tools for EPBD transposition, environmental impact of buildings, indoor environmental quality, thermal energy systems and building thermal simulations, solar airconditioning. Leader of Group Energy Conservation in IERSD at NOA, staffed by an associate research scientist and two research assistants. Project coordinator, scientist-in-charge, task leader and participant in 50 R&D and demonstration projects financed by the European Commission, national Ministries and organizations, and the private sector. Teaching on building energy management, renewable energy sources, rational use of energy, heat transfer.