John Marshall is a Professor of Surgery and Critical Care Medicine at the University of Toronto, and a Senior Scientist in the Li Ka Shing Knowledge Institute of Unity Health Toronto. He received his medical degree from the University of Toronto, followed by post-graduate training at Dalhousie University in Halifax and McGill University in Montreal. He is the rounding and current Chair of the International Forum for Acute Care Trialists (InFACT), past-Chair of the International Sepsis Forum (ISF) and the Canadian Critical Care Trials Group (CCCTG), former Secretary-General of the World Federation of Societies of Intensive and Critical Care (WFSICC), and past-President of the Surgical Infection Society (SIS). He is an Associate Editor of the journal, Critical Care, and a Senior Editor of Critical Care Medicine. He has published more than 500 peer-reviewed manuscripts, and has been cited more than 150,000 times (Google Scholar). He has a long-standing interest in host-microbial interactions, and in sepsis clinical trials, as well as a laboratory interest in the cellular mechanisms that regulate neutrophil survival.