John Davis joined Magenta from Pfizer, where he was Senior Vice President and Head of Early Clinical Development. Prior to Pfizer, John served as Vice President and Global Therapeutic Area Head of Immunology at Baxalta and as Senior Group Director and Head of the Inflammation and Cardiovascular/Metabolism Group in the Early Clinical Development Group at Genentech. John spent nearly 10 years on faculty at the University of California, San Francisco leading clinical research in autoimmune diseases, and he is Professor of Clinical Medicine. He continues to see patients, teach, and serve as volunteer faculty at the Boston VA Medical Center.

John earned an MD from the University of Maryland where he graduated summa cum laude. John trained in internal medicine and rheumatology at the University of California, San Francisco. He continued training in clinical research and rheumatology at the National Institutes of Health NIAMS intramural program. He holds an MPH in epidemiology from the University of California, Berkeley, and an MS in anatomical science from the University of Maryland School of Medicine.