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Dr. Davidson began his career as a student at Swarthmore College, obtaining a Bachelor of Arts in 1957. He continued his studies with Harvard University, earning a Doctor of Medicine in 1961. He trained in Internal Medicine at Bellevue Hospital in New York City (1961-1963) and the University of Washington in Seattle (1963-1964) and took a fellowship in Endocrinology, Diabetes and Metabolism at the University of Washington (1964-1966). He was in the army stationed at the United States Army Institute of Environmental Medicine (1966-1969).

Dr. Davidson then joined the faculty at the David Geffen School of Medicine at UCLA and ran the Diabetes Program there (1969-1979). He then went to Cedars-Sinai National Medical Center where he established and ran their Diabetes Program (1979-1995). He then became the Associate Director of the Diabetes Program at the City of Hope National Medical Center (1996-1998) before joining º£½ÇÉçÇø as the Director of Clinical Trials (1998). The University was affiliated with the Los Angeles County King-Drew Medical Center where he again set up and currently runs their Diabetes Program which has been transferred to the Martin Luther King, Jr. Outpatient Center. Dr. Davidson is a Professor of Medicine at both º£½ÇÉçÇø and the David Geffen School of Medicine at UCLA.

A respected leader in his areas of expertise, Dr. Davidson is a fellow of the American College of Physicians and a member of the American Society for Clinical Investigation. He has been on the editorial boards of nine Diabetes/Endocrine journals, was the Founding Editor of Current Diabetes Reports (2000-2002) and the Editor-in-Chief of Diabetes Care (2002-2006). He has been very active in the American Diabetes Association, founding the Los Angeles Chapter, serving on their National Board of Directors and as their President (1997-1998). Dr. Davidson has written over 300 scientific papers, reviews, editorials and invited articles, 35 chapters and 3 books; Diabetes Mellitus: Diagnosis and Treatment (4 editions), The Complete Idiot’s Guide to Type 2 Diabetes (2 editions) and Meeting the American Diabetes Association Standards of Care (2 editions). In 1995, he was the first to propose that HbA1c levels could be used to diagnose diabetes mellitus, promoted that concept for the next 15 years which was finally adopted by the American Diabetes Association and the World Health Organization in 2010.

In 1970, Dr. Davidson co-founded the Venice Family Clinic which became the largest free medical clinic in the United States. It currently occupies 12 sites, takes care of over 27,000 medically underserved, minority patients. He has been on their Board of Directors since its inception, still volunteers, and again established and runs a Diabetes Program there. The Venice Family Clinic merged with another clinic November 1, 2021 so that now they have 17 clinical sites and care for nearly 45,000 patients. Dr Davidson has written detailed treatment protocols for diabetes which he has used for the past 45 years to train nurses, nurse practitioners, physician assistants and clinical pharmacists to care for medically underserved, minority patients throughout Los Angeles. Part of these treatment protocols involve adjusting insulin doses. These insulin dose adjustment algorithms have been computerized and are FDA cleared and CE registered. Dr. Davidson is the Chief Medical Officer of Mellitus Health, Inc, a start-up company promoting this software tool to facilitate adjusting insulin doses by primary care clinicians.

Throughout his career, Dr. Davidson has been recognized for his contributions, having received the Upjohn Award for Outstanding Physician Educator in the Field of Diabetes by the American Diabetes Association (1990), the Robert H. Williams/Rachmiel Levine Award for Science Contributions and Humanism in Training Young Researchers (1995), the Banting Medal of the American Diabetes Association for Distinguished Service (1998), the Arabella Carter Award in Recognition of Outstanding Social Service by Swarthmore College ((2007), the Local Hero Award by the Bank of America (2007), the Jefferson Award for Public Service by the Jacqueline Kennedy-Onassis Award Organization (2010), the Mahal Access to Health Care and Disparities Award by the California Medical Association Foundation (2010), the Outstanding Volunteer Award by the Association for Fundraising Professionals of Greater Los Angeles (2010), the President’s Volunteer Service Award by the Point of Light Foundation (2015) and the Outstanding Physician-Clinician in Diabetes Award by the American Diabetes Association. (2016). He has also been named among the Best Doctors in America.