Following his PhD in Geography from the University of Marburg (Germany), Jan Marco Müller's early career included assignments as Assistant to the Scientific CEO of the Helmholtz Centre for Environmental Research (UFZ) in Leipzig (Germany), Programme Manager of the JRC Institute for Environment and Sustainability in Ispra (Italy), and Head of Business Development & Public Relations of the Centre for Ecology & Hydrology (CEH) in Wallingford (UK). During these years he also served as Founding Secretary of the Partnership for European Environmental Research (PEER), the network of Europe's largest environmental research centres. Since 2009 he worked at the science-policy interface, first as Assistant to the Director-General of the Joint Research Centre (JRC) in Brussels. 2012-2014 he managed the office of the first Chief Scientific Adviser to the President of the European Commission Professor Dame Anne Glover, supporting her throughout her tenure and shaping the activities of the office. Following a 5-month fellowship with US science policy expert Roger Pielke jr. at the University of Colorado, he helped between January 2016 and March 2017 to set up the European Commission's new Scientific Advice Mechanism. Since April 2017 he is the Head of the Directorate Office of the International Institute for Applied Systems Analysis (IIASA) near Vienna, serving also as Coordinator for Science to Policy and Science Diplomacy of this prestigious institution.