Dr. Hans-Otto P？rtner received his PhD and habilitated in Animal Physiology at Münster and Düsseldorf Universities. As a Research and then Heisenberg Fellow of the German Research Council he worked at Dalhousie and Acadia Universities, Nova Scotia, Canada and at the Lovelace Medical Foundation, Albuquerque, New Mexico, USA, before he became Professor and Head of Integrative Ecophysiology at the Alfred Wegener Institute, Bremerhaven, Germany. He has established theory and evidence on effects of climate warming, ocean acidification, and hypoxia on marine animals and ecosystems. His efforts focus on linking biogeography and ecosystem functioning to molecular, biochemical and physiological mechanisms shaping organism tolerance and performance. In October 2015 he was elected Co-Chair of IPCC Working Group II for AR6. He is a Clarivate Analytics highly cited researcher 2018 and 2019.