Martin Heimann Heimann is Director Emeritus at the Max Planck Institute for Biogeochemistry (Jena, Germany). His research interest centers on the biogeochemistry of the global carbon cycle, modeling and quantification of the interactions between biogeochemical cycles and the physical climate system, and the development of global, continental and regional observing systems for long-lived biogeochemical trace gases. He contributed as a lead author of Working Group I to the IPCC’s 1995, 2001, 2007 and 2013 assessment reports. Editor of several journals and a Review Editor of Science, he appears as a Highly Cited Researcher in the 2018 Web of Science list. Among other honors, he is a member of Academia Europaea and of the International Eurasian Academy of Sciences, and holds the A.M. Obukhov Medal, bestowed by the Institute of Atmospheric Physics of the Russian Academy of Sciences.