Mike Thomas President and Chief Executive Officer at John Muir Health
Michael S. Thomas

President and Chief Executive Officer
John Muir Health

Mike Thomas became President and Chief Executive Officer of John Muir Health in October 2022. Prior to this role, he served as Executive Vice President and Chief Transformation Officer at John Muir Health. In that role, he was responsible for the development and execution of health system strategy, value-based care operations, medical group operations, and the health system’s Canopy Health and BayHealth (part of the UCSF Health partnership), UCSF-John Muir Health Cancer Network, and Tenet Healthcare joint ventures.  

Mr. Thomas also served as President and Chief Administrative Officer of John Muir Health–Concord Medical Center and Behavioral Health Center for nine years. Prior to joining John Muir Health, Mr. Thomas served as Executive Officer of VHA West Coast. Before that, he was Chief Strategic Development Officer at UCSF Medical Center and UCSF Children’s Hospital.

Mr. Thomas received his Master of Business Administration in Finance from the Wharton School of University of Pennsylvania, and a Bachelor of Arts in Economics from Claremont McKenna College.

Jane Willemsen Chief Operating Officer at John Muir Health
Jane A. Willemsen

Chief Operating Officer
John Muir Health

Jane Willemsen serves as John Muir Health’s first Chief Operating Officer. In her role, she has responsibility for all John Muir Health hospital, physician practice and value-based care operations. In addition to these responsibilities, Ms. Willemsen serves as Governing Board Co-Chair of the highly successful Children’s Specialty Services Partnership, a joint venture with Stanford Children’s Health/Lucile Packard Children’s Hospital.

Before assuming her new position, Ms. Willemsen served as Executive Vice President and President of Hospital Operations for five years and President and Chief Administrative Officer of the Walnut Creek Medical Center for 10 years. Under her leadership, the medical centers achieved numerous quality recognitions, including being named as one of America’s and among the region’s top hospitals by U.S. News and World Report with a nationally ranked service(s) for 15 consecutive years. Both the Concord and Walnut Creek Medical Centers also have achieved Magnet® recognition status for excellence in nursing services and quality nursing care. 

Prior to joining John Muir Health in 2006 as President and Chief Administrative Officer of the Walnut Creek Medical Center, Ms. Willemsen served as Executive Vice President and Chief Operating Officer at Queen of the Valley Medical Center in Napa, California. She also worked at the Rehabilitation Institute of Chicago as Vice President of Nursing and Allied Health and Assistant Director of Nursing. She received a Bachelor of Science degree in Nursing from the University of Iowa, and a Master of Management degree from the Kellogg Graduate School of Management at Northwestern University.

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