Stefan Wehrmeyer is the creator of, an interactive travel time visualization of urban transportation systems.

He is a founding member of the German Open Data Network, engaged in the German Open Data movement and works for the Open Knowledge Foundation as a developer. When he is not hacking on his side projects or exploring new ideas about what to do with data, he studies for his Master's degree in IT-Systems Engineering at the Hasso Plattner Institute in Potsdam.