Michaël Grelaud obtained his PhD in Geosciences of the Environment from the University of Aix-Marseille III in 2008, focusing on El Niño's impact on marine calcareous phytoplankton along the North American Pacific margin. In 2009, he began a postdoc at ICTA with P. Ziveri, studying the Mediterranean phytoplankton's response to climate change. He has since researched the effects of ocean acidification and warming on Mediterranean calcifiers due to human-induced climate change. Specializing in paleoceanography and paleoclimatology, he manages SYRACO, a coccolith recognition system. In 2017, he added to his research line another issue threatening the Mediterranean Sea, the marine plastic (micro)litter.