Ulrich Pöschl has been a champion of Open Access as a researcher and university lecturer since 2000. A chemist by training, he conducts research in the field of atmospheric, climate and health sciences. He is a scientific member of the Max Planck Society, Director at the Max Planck Institute for Chemistry, and Professor at the Johannes Gutenberg University in Mainz. Pöschl is also the founder and editor of Atmospheric Chemistry and Physics (ACP), the world’s first scholarly Open Access journal with public peer review, and the initiator of the international Open Access initiative OA2020. Supported by a Schrödinger Fellowship from the Austrian Science Fund FWF, Pöschl did postdoctoral research at the Massachusetts Institute of Technology in Cambridge, Mass. (USA), from 1996 to 1997.