Stelios Zerefos has been practicing architecture since 1999. In the period 2003-2008 he was elected as visiting lecturer at the National Technical University of Athens School of Architecture, and in 2009 he was elected Assistant Professor of the School of Applied Arts at the Hellenic Open University. He is the director of the M.A. "Lighting Design" and the Architectural Lighting Design Laboratory of the Hellenic Open University. Since 2018 he has been appointed as Professor in the School of Applied Arts and Sustainable Design.
He has published two books on lighting design and translated Vitruvius' "Ten Books on Architecture" in Greek. Apart from university publications, he has publications in scientific journals, chapters in collective scientific volumes, international conference proceedings and architectural magazines.
Professionally he retains an architectural practice in Athens focused on architectural, sustainable, lighting and low energy design. He has taken part and contributed at several architectural competitions acquiring seven awards and distinctions the most important of which include a distinction at the Grand Egyptian Museum International Ideas Competition (2002), the first equal prize at the architectural competition for fire victims in the extended fires of August 2007, the first prize at the architectural competition for the refurbishment of the Municipal Theatre of Corfu and its piazza in 2010 and the EUROPA NOSTRA award for the conservation of the National Observatory of Athens in 2010.
He is a member of the Technical Chamber of Greece, as well as international organizations, member of EU Actions COST ES1204 "Loss of the Night Network" and COST C13 “Glass and the interactive building envelope”. He has contributed at conference scientific committees and lectured at the European Masters’ Degree for Renewable Energy Sources and other international workshops.