Since 2008, Bernhard Sommer has been involved in setting up – under the guidance of Prof. Brian Cody – the Department of Energy Design at the University of Applied Arts in Vienna, where he is in charge of research and teaching. He is chairman of the architecture study commission and Bologna representative of the University of Applied Arts. Sommer was a visiting professor of energy-efficient design at the Estonian Academy of Arts (EKA) in Tallinn from 2016 to 2020. He is vice president of the Chamber of Civil Engineers for Vienna, Lower Austria and Burgenland, as well as honorary managing director of the Chamber's advanced training facility, the zt: akademie. He is a member of the digitization committee and chairman of the chamber's OIB guidelines committee and represents the chamber at the stakeholder advisory board of the Austrian Institute for Building Technology (OIB). He has held many lectures at numerous universities in Germany and abroad, including the University of Innsbruck, the TU Delft, the Harvard Graduate School of Design, the University of Lincoln, and the American University of Beirut.
In 2006, he founded the civil engineering office EXIKON architecture and sustainability. The office was awarded the State Prize for Architecture and Sustainability in 2019 by fasch and fuchs for planning the energy efficiency, building physics, and ecology of the Aspern Federal School.