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Harry L. Leider, M.D., M.B.A. joined Gelesis from Walgreens, where he was Chief Medical Officer and Group Vice President and provided executive leadership for the Company’s unique platform to impact the six million customers who visit a Walgreens store each day, as well as the two million customers who interact with Walgreens digitally.

Prior to joining Walgreens, Dr. Leider served as Chief Medical Officer and Senior Vice President of Ameritox, a national specialty laboratory providing medication monitoring services to physicians treating chronic pain and serious mental illness. Previously, he was Chief Medical Officer of XLHealth, a national Medicare Advantage plan that served seniors with common chronic illnesses.

Dr. Leider speaks frequently to national audiences and is a core faculty member for the American Association of Physician Leadership where he also served as a recent past-President and Board Chairman. Dr. Leider has also served on the faculty of Harvard Medical School and the Johns Hopkins Carey School of Business. With over 25 years of experience as a senior healthcare executive for a variety of innovative healthcare companies, his passion is leveraging his business, leadership, and clinical skills to create programs, services, and intellectual property that improve the health of large populations at scale.