Professor Ulf Riebesell is a biological Oceanographer at GEOMAR Helmholtz Centre for Ocean Research Kiel in Germany. The focus of his research is on the effects of environmental change (ocean warming, acidification and deoxygenation) on marine ecosystems: from plankton physiology, ecology and evolution to food web interactions and biogeochemical cycling in the ocean. Since 2009 Prof. Riebesell has been the coordinator of the German national research programme Biological Impacts of Ocean Acidification (BIOACID) funded by the German Ministry for Education and Research. He contributed to the Millenium Ecosystem Assessment Repor and the German Advisory Council on Global Change (WBGU) special report “The Future Ocean“ Warming Up, Rising High, Turning Sour. In 2011 he received the Vernadsky Award of the European Geosciences Union and in 2012 the Leibniz Award of the German Research Foundation. In 2016 he was awarded an Advanced Grant of the European Research Council.