Ellen Matthies has been a professor for Environmental Psychology at the Ottovon- Guericke-University Magdeburg (Germany) since December 2011. Her main research field is man-environment-interactions with a focus on environmentally relevant behaviour (electricity use and car use) and sustainable consumption. Ellen Matthies was from August 2009 until November 2011 Professor for Environmental Psychology at the Norwegian University of Science and Technology, Trondheim, Norway. From 2001 to 2010 she was an associate professor for Applied Psychology at the Ruhr-University Bochum, Germany, where she also received her PhD. She has lead several interdisciplinary research projects (e.g. the project “Determinants of household energy consumption” within the Helmholtz-Alliance ENERGY-TRANS).