Swiss federal authorities

ENSI Executive Board

  • Dr. Marc Kenzelmann

    Director General: Marc Kenzelmann studied biology and received his doctorate in 1999 from the University of Bern’s Institute of Infectious Diseases. After several years of research at the Cancer Research Centre in Heidelberg, he moved to the Federal Office for Civil Protection in 2007. There he worked until 2013 as Head of the National NBC…

  • Dr. Felix Altorfer

    Director, Waste Disposal Division: Felix Altorfer studied physics at the ETH Zurich, and obtained his doctorate in 1994 at the Laboratory for Neutron Scattering at the ETH. After working in the US for four years at the NIST Center for Neutron Research, National Institute of Standards and Technology, he returned to Switzerland to undertake research…

  • Tamara Garny

    Director, Resources Division: Tamara Garny studied English and German Literature and Linguistics at the University of Zurich. Before joining ENSI she held a number of different positions with the Swiss Insurance Association (SVV) where she was an Executive Board member and Director of the Finance, HR and Administration Department since 2011.

  • Dr. Rosa Sardella

    Director, Radiation Protection Division: Rosa Sardella studied nuclear engineering at the University of Bologna, where she also obtained her doctorate in 1997 in the Department of Mechanical, Nuclear, Aviation and Metallurgical Engineering. Since July 2016, Rosa Sardella has been Director of the Radiation Protection Division, as part of the ENSI Board.

  • Dr. Ralph Schulz

    Director, Safety Analyses Division: Ralph Schulz studied mechanical engineering at the RWTH Aachen University specialising in thermodynamics and obtained his doctorate at the end of 1997 from the Laboratory for Energy Systems at ETH Zurich. Following a period of three years with ALSTOM Power working on the development of combined cycle power plants, he joined…

  • Dr. Jens Karl Bender

    Dr. Jens Karl Bender

    Pending the appointment of a permanent successor to Annette Ramezanian, Jens Karl Bender is serving as acting head of the Nuclear Power Plants Division.

  • Patrick Tschudin, new Chief of Staff of ENSI's Directorate Division

    Patrick Tschudin

    Patrick Tschudin has been Director of Staff of the Directorate Division since 1 August 2026.