Staff Members

GBG team

GBG Head Office Berlin

Björn Klusmann
Managing Director
M.Sc. in Public Policy
Member of GBG Staff since 08/2015
Tel: +49-(0)30-76 23 991-40
bjoern.klusmann (at)

Dmitriy Romanov
B.A. Business Administration
Member of GBG Staff since 10/2016
Tel: +49-(0)30-76 23 991-32
dmitriy.romanov (at)

Martin Ruck
Communications Officer
M.A. Political Science
Member of GBG Staff since 08/2013
Tel: +49-(0)30-76 23 991-41
martin.ruck (at)

Swantje Fiedler (née Küchler)
Deputy Managing Director | Director Energy Policy
M.A. European Studies
M.A. International Business Management
Member of GBG Staff since 07/2009
Tel: +49-(0)30-76 23 991-50
swantje.fiedler (at)

Lena Reuster
Research Associate Energy Policy
M.Sc. Economics
Member of GBG Staff since 08/2012
Tel: +49-(0)30-76 23 991-51
lena.reuster (at)

Rupert Wronski
Research Associate Energy Policy
M.A. Sustainability Economics and Management
Member of GBG Staff since 09/2013
Tel: +49-(0)30-76 23 991-52
rupert.wronski (at)

Florian Zerzawy
Research Associate Energy Policy
Diploma in Geography
Member of GBG staff since 07/2016
Tel.: +49-(0)30-76 23 991-54
florian.zerzawy (at)

Alexander Mahler
Deputy Managing Director | Director Transport and Agricultural Policy
Master of Human Geography
Member of GBG Staff since 01/2012
Tel: +49-(0)30-76 23 991-55
alexander.mahler (at)

Matthias Runkel
Research Associate Transport and Agricultural Policy
M.Sc. Economic Studies
Member of GBG Staff since 07/2014
Tel: +49-(0)-30-76 23 991-56
matthias.runkel (at)

Jacqueline Cottrell
Senior Policy Advisor
M.A. History
M.A. International Peace & Security
Member of GBG Staff since 07/2004
jacqueline.cottrell (at)

Current interns

Anna Rückes
Studies B.Sc. Economics

Philipp Thunshirn
Studies Dipl.-Ing. Environment and Bioresources Management
Studies Dipl.-Ing. Material and Energetic Exploitaion of Renewable Raw Materials

Lisa Wötzel
Studies M.A. Linguistics and Media Science


Pictures: Stephanie Leisten