Our Guest Contributors


tim Tim Birkholz is a diploma engineer in Urban and Regional Planning, member of the urban culture network Urbanophil, and founding member of the Volksentscheid Fahrrad in Berlin. He is now CEO for AGFK in Mecklenburg-Vorpommern.

Katja Leyendecker is a Chartered Engineer in environmental engineering and has been living in the north east of England for 20 years. In 2010 together with her co-activist Claire Prospert, she founded the Newcastle Cycling Campaign an organisation committed to campaigning for the planning and building of cycleways. Katja has just finished her doctoral thesis on “Democracy, politics and activism: Women’s voices for Cycleways in Bremen and Newcastle”.

Blog: http://katsdekker.wordpress.com   Twitter: https://twitter.com/katsdekker


Denis Petri has his doctorate in Chemistry and also studied urban history and specialized in history of mobility. He organized the collection of signatures for the Citizens’ Cycling Initiative. As a member of the board of Changing Cities, he is fighting for livable cities and to take back public space that has been privatized by the automobile. He is currently employed as a research assistant in Berlin’s House of Representatives, working on city development and smart cities.

Angelika Schlansky studied urban and regional planning at the TU Berlin. She has been living in Bremen since 1983, initially working in a freelance planning office and a city planning office. As a freelance city planner, she has produced studies on pedestrian traffic and car sharing, in between she also worked for district marketing in Kattenturm.

On behalf of the city of Kiel, in 2012 and 2015 she developed footpath axis concepts for two areas of the city of Kiel in cooperation with the StadtVerkehr office in Hilden. Since 1985 she is member of the board of FUSS e.V. Fachverband Fußverkehr Deutschland. From 2011 to 2019 she was a member of the Advisory Council in the district of Östliche Vorstadt for the Greens.


Bernd W. Thomsen is a trained electrician and  retired pedagogue. He has worked in Gehrden and Hanover as an educator. During his professional career he initiated with a team the internet networking of the project “Eco Schools in Europe” by presenting this project idea at an environmental fair in Lüneburg and a meeting of the project countries in Manchester/UK. The European project has meanwhile become an international project in which Bremen is also involved.

As a member of the Schwachhausen Beirat he campaigned through a citizen’s application to restore barrier-free tram and bus stops. He founded the Initiative Autofreie Geh- und Radwege (Car-free footpaths and cycle paths initiative) and is a member of the Bremer Bündnis für die Verkehrswende (Bremen Alliance for a Transport Transition), where he aims to help establish wider resident parking and comprehensive car parking management in the city.


Mark Peter Wege is a graduate psychologist as well as founder and spokesman of the initiative Einfach Einsteigen. Previously, he worked as a social worker taking care of families and refugees. Therefore, a social perspective on the traffic turnaround is important to him. From 2015 to 2017, he worked at the alternative rail start-up Locomore, where his responsibilities included developing and implementing the crowdfunding campaign, designing the social media work and building up customer support. He has been involved with social and environmental movements since his school days for many years. In the past he has, among other things, imposed beverage cans on the Brandenburg Gate, organized various conferences and blocked Castor transports. When there is space for it, he likes to spend more time on the Way of St. James.