The International Journal of Technology Management (IJTM) just published a special issue on „When Innovation Meets Sustainability Challenges„. Among the six papers is a paper that I have authored together with Cornelius Herstatt and Tim Schiederig entitled „Firms‘ transition to green product service system innovators: cases from the mobility sector„. In the paper we present and discuss how firms can become innovators of product service systems based on three cases from urban, future mobility solutions (car2go, Hertz on Demand, Better Place).