James D. Leo, MD

Dr. Leo was born and raised in Hollywood, California. After experiencing New England life and weather while attending the Massachusetts Institute of Technology for undergraduate studies in Biology, he returned to California to attend medical school at the University of California, San Francisco, thereby trading in the cold winters of Massachusetts for the constant fog of San Francisco.
After receiving his Medical Degree in 1981, Dr. Leo returned to Southern California, where he has remained happily since. After completing residencies in Emergency Medicine and Internal Medicine, with a one-year stint as an Emergency Department Director in between, he established his practice in Internal Medicine and Critical Care Medicine in Long Beach. Dr. Leo serves as the Chief Medical Officer for the MemorialCare Health System, leading MemorialCare’s work on evidence-based care.  He also serves as Board Chair of the MemorialCare Physician Society. His private practice emphasizes wellness and disease prevention, along with the evaluation and management of conditions typically seen in adult internal medicine.  Dr. Leo holds Board Certifications in Internal Medicine, Critical Care Medicine, Emergency Medicine, and Clinical Lipidology.
This physician is a member of the MemorialCare Physician Society, which drives clinical outcomes and performance for MemorialCare Health System.
This physician uses an electronic medical record system. This physician uses myMemorialCare to access and store patient health information via the Epic ambulatory electronic medical record system. Patients of this practice may also securely view their health information online via
myMemorialCare (myChart), Epic's patient portal.


  • Critical Care Medicine
  • Internal Medicine


Medical Education
UC San Francisco School of Medicine
Date Completed:
July 1 1981
Long Beach Memorial Medical Center

MemorialCare Hospital Affiliations