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.
Executive Vice President and President, Hospital Operations – Walnut Creek & Concord Campuses and John Muir Behavioral Health
Jane oversees the operations of John Muir Health’s two acute care medical centers located in Walnut Creek (554-licensed beds) and Concord (244-licensed beds), and a third facility for Behavioral Health services (73-licensed beds) also located in Concord, serving Contra Costa and Solano counties. Combined, the three facilities have net revenues of $1.3 billion, 3,686 FTEs, and 32,620 discharges. Her responsibilities also include overseeing strategic service lines, medical staff relations, and accountability for completion of major expansion projects at all three facilities.
In addition to these responsibilities, Jane 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. She also serves as a member of the John Muir Health Executive Operations Council, which makes key decisions and sets the strategic direction for the health system. In addition, she recently oversaw the $300M implementation and rollout of the Epic© electronic medical records system throughout John Muir Health.
Before assuming her new position, Jane served as President and Chief Administrative Officer of the Walnut Creek Medical Center for 10 years. Under her leadership, the medical center achieved numerous quality recognitions, including being named as one of America’s and the region’s top hospitals by U.S. News and World Report with a nationally ranked service(s) for 11 consecutive years. The medical center was also named by Healthgrades as one of America’s 50 Best Hospitals from 2014-2017 and achieved the Distinguished Hospital Award for Clinical Excellence (top 5% nationally for clinical excellence) for seven consecutive years. The Walnut Creek Medical Center also achieved Magnet® recognition status for excellence in nursing services and quality nursing care in 2008 and re-designation in 2013.
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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