Ronald Kleinman, MD, is Chief of the Department of Pediatrics at Massachusetts General Hospital and Physician-in-Chief at MassGeneral Hospital for Children (MGHfC) and Mass General Brigham Pediatrics.

Dr. Kleinman is Charles Wilder Professor of Pediatrics at Harvard Medical School.

Dr. Kleinman earned his medical degree from New York Medical College and his master's degree from Harvard Medical School. After completing his residency in Pediatrics at Montefiore Hospital,  Albert Einstein Medical Center in New York, Dr. Kleinman joined Mass General in 1977 as a Clinical and Research fellow in  Pediatric Gastroenterology, Hepatology & Nutrition . He has served as a member of the Department of Pediatrics since then and also served as the Chief of the Pediatric Gastrointestinal, Hepatology and Nutrition Unit before becoming Chief of the Department of Pediatrics at MGH.

Dr. Kleinman has distinguished himself through numerous contributions to the hospital's management and governance, including service as a member of the Board of Trustees of the MGPO.  He serves on multiple boards of directors for non-profit organizations committed to the well-being of children and their families both locally, nationally and internationally.  He is an active researcher in the field of infant and child nutrition and has authored multiple papers and textbooks on subjects in his specialty.