Board of Directors


greenTEG’s board of directors is presided by Gianni Operto and consists of investors and independent members. The board brings in comprehensive experience and network in entrepreneurship, finance and the energy business.


Dr. Werner Berner


Werner Berner has a degree in mechanical engineering. He is also a physicist with a Ph.D. from the University of Berne. He worked in several management positions before co-founding PI precision implants AG in 1992. This company was merged with Plus Endoprothetik AG to Plus Orthopedics AG which was sold to Smith & Nephews in 2007. He is founder of the Berner Partners AG, which invests in early stage start-ups.

Dr. Werner Berner

Dr. Andreas P. Friedrich


Andreas P. Friedrich received his M.Sc. in microengineering and Ph.D. in solid state sensors and microsystems from EPFL in Lausanne. He also holds an executive MBA in management of technology – MoT degree from UNIL and EPFL. From 1999 to 2003 he worked in management positions at two German SMEs before joining Allegro MicroSystems Europe Ltd., where he is currently leading Allegro’s two European Sensor Technical Centres in France and Germany.

Gianni Operto

Dr. Pascal Gerner


Pascal Gerner has ten years of experience in sales, marketing and product management of semiconductor sensor solutions. He studied Inorganic Chemistry at Berne (CH) and Bangor University (UK). He also holds a Ph.D. in non-linear optics and spectroscopy from the University of Berne. Mr. Gerner is currently Director of Sales & Marketing for humidity and gas sensor products at Sensirion AG.

Dr. Pascal Gerner

Dr. Wulf Glatz (CEO)


Wulf received his Ph.D. from ETH Zurich in 2008, where he developed flexible thermoelectric generators at the Micro and Nanosystems group. He has studied with several international institutions in Spain, the US, and Germany. Wulf has gathered industry experience at the R&D departments of Volkswagen, BOSCH and IBM, working on thermal interfaces and micromechanical sensors for automotive applications. Wulf is also a board member of the Swiss Thermoelectric Society (STS).

Dr. Wulf Glatz

Gianni Operto (President)


Gianni Operto has more than 20 years of experience in Cleantech Venture Capital working for companies like Emerald or Good Energy. Prior he served as CEO of the Utility of Zurich (ewz) and as Vice President at ABB Power. Gianni Operto is mechanical engineer by education.

Gianni Operto

Heinrich Köhler


Mr. Köhler was managing director at Borgwaldt Flavor GmbH from 1988 until he sold the company in 2013. Previously he held managing positions at Deutsche Afrika Linien in Hamburg (Germany) and Lagos (Nigeria) where he also served as representative for Germany’s Federal  Ministry for Economic Cooperation and Development. From 1968 to 1975, Mr. Köhler was second managing director at the Afrika Verein in Hamburg and in 1970 temporarily worked for Germany’s Federal Ministry of Economic Affairs in Osaka (Japan). He holds a degree in economics and is a marine officer. Today as well as in the past, Mr. Köhler held various honorary posts.

Heinrich Köhler

Dr. Etienne Schwyter


Etienne holds a Ph.D. (2013) degree from ETH Zurich for the development of a scalable fabrication process for thermoelectric devices, including a fully automated characterization setup for in-process and end-control device measurements. He is a founder of greenTEG and responsible for production. Etienne graduated with a degree in Electrical Engineering from ETH Zurich after gaining practical experience at Micronova in Finland, and the University of Calgary in Canada.

Dr. Etienne Schwyter