Select a link below to learn more about members of the Advocate Physician Partners leadership team.

Dr. Lee Sacks | Dr. Mark Shields

Lee B. Sacks, MD Executive Vice President, Chief Medical Officer, Advocate Health Care; CEO, Advocate Physician Partners

Dr. Lee Sacks has served as Chief Executive Officer of Advocate Physician Partners since its creation in 1995.  Advocate Physician Partners is a care management and managed care contracting organization that includes over 4,000 physicians and serves 230,000 capitated and 700,000 PPO enrollees via clinically integrated contracts across Chicagoland.

In 1997, he assumed the additional responsibilities of Executive Vice President and Chief Medical Officer of Advocate Health Care. In these roles, he is responsible for clinical excellence, risk management / insurance, supply chain, clinical laboratories, research, medical education, managed care contracting and PHO operations.

Prior to the formation of Advocate, Dr. Sacks served as Vice President of Lutheran General Health Plan and Vice President, Primary Care Development for Lutheran General HealthSystem. In these dual roles, he was responsible for strengthening Lutheran General HealthSystem's primary care infrastructure and the medical management of the Lutheran General Health Plan.

Dr. Sacks is a member of the American College of Physician Executives and a Fellow of the American Academy of Family Physicians.

He holds a Bachelor of Science degree in chemical engineering from the University of Pennsylvania and a Doctor of Medicine degree from the University of Illinois, College of Medicine. He completed his family practice residency at Lutheran General Hospital in Park Ridge, Illinois, where he served as Chief Resident.

He currently serves on the Metro Chicago board of the American Heart Association, is a governor of the Institute of Medicine Chicago and is Board Chairman of the Institute for Clinical Quality and Value. 

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Mark Shields M.D., M.B.A. Senior Medical Director, Advocate Physician Partners; Vice President, Advocate Health Care

Dr. Mark Shields holds the position of Senior Medical Director for Advocate Physician Partners and Vice President of Medical Management for Advocate Health Care. In this role Mark oversees all clinical functions related to 4,000 physicians aligned with ten Advocate hospitals. Mark has over 25 years experience in management roles with medical groups, insurance companies, hospitals and integrated delivery systems.

Prior to joining Advocate Physician Partners, Mark held the position of Chief Medical Officer for Kaleida Health in New York, was the Chief Medical Officer at Dreyer Medical Clinic, Consulting Medical Director of HMOI and President and Co-founder of a primary care group.

In addition to his impressive medical background, Dr. Shields has extensive experience in operations, strategic planning, market analysis and finance. He has served on the boards of directors of the Alliance of Independent Academic Medical Centers (AIAMC) and the Medical Group Management Association (MGMA) and on the Committee on Health Professions of the American Hospital Association. He is board certified in Internal Medicine, a Fellow of the American College of Physicians and a graduate of Harvard Medical School and the University of Chicago Business School.

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