Sandia Energy > Programs > Renewable Energy > Photovoltaic Solar Energy > People > Mario Theristis, PhD Marios Theristis, PhD Senior Member of the Technical Staff Marios Theristis is a Senior Member of the Technical Staff in the Photovoltaics and Materials Technology Department at Sandia National Laboratories. His research interests include PV performance modeling and monitoring, reliability, degradation, failure diagnostics/prognostics, and data analytics. Prior to joining Sandia National Laboratories, he was at the University of Cyprus, Cyprus (2016-2019), the University of Jaén, Spain (2016), Fraunhofer CSE, USA (2015), and NCSR “Demokritos,” Greece (2010-2011). Marios received his Dipl.-Ing. in Electrical and Computer Engineering from Democritus University of Thrace, Greece (2011), and his PhD from Heriot-Watt University, UK (2016). See Dr. Theristis’ Google Scholar profile.