Executive Team

Our Executive Team

Calvin "Cal" Knight, President and CEO John Muir Health

Calvin "Cal" Knight
President and CEO
John Muir Health

Mr. Knight recently joined John Muir Health as President and CEO.  He most recently came from Swedish Health Services in Seattle, Washington where he served as President and COO.

At that organization, Mr. Knight was accountable for all Swedish Health Services operations, including its five medical campuses (including two tertiary medical centers) and multiple ambulatory care sites. He had also been a key leader and strategist in building a multi-specialty physician organization and in the development of highly-regarded Orthopedics, Cancer, Cardiovascular, Neurosciences, Women & Infants, and Pediatrics service lines.

Mr. Knight holds master's degrees in health administration and business administration from the University of Iowa, as well as a bachelor's degree from Western Washington University.

Michael S. Thomas  Michael S. Thomas, President and CAO John Muir Health, Concord Campus

Michael S. Thomas
President and CAO
John Muir Medical Center, Concord

As president and chief administrative officer of John Muir Medical Center, Concord, Mike Thomas is responsible for leading efforts to achieve the clinical, strategic, operational and financial goals of the medical center and John Muir Health.  Mike also has responsibility for the development, growth and operations of the Oncology, and Cardiovascular service lines, Facilities Development and Corporate Real Estate, Medical Imaging, and the Behavioral Health Center.  He is also the executive sponsor of the health system’s hospitalist program.

Prior to joining John Muir Health, Mike served as executive officer of VHA West Coast for four years. Before that, Mike was chief strategic development officer/senior vice president at UCSF Medical Center and UCSF Children's Hospital. While at UCSF, Mike was also responsible for the administrative leadership of the Mt. Zion campus.

Mike received his Master of Business Administration in Finance from the Wharton School of the University of Pennsylvania; and a Bachelor of Arts in Economics from Claremont McKenna College. He resides with his family in Alamo.

Jane A. Williamsen, President and CAO, John Muir Health

Jane A. Willemsen
President and CAO
John Muir Medical Center, Walnut Creek

Jane A. Willemsen, President and CAO of John Muir Medical Center, Walnut Creek – Ms. Willemsen was appointed President and Chief Administrative Officer (CAO) of John Muir Medical Center in Walnut Creek in July, 2006, where she is responsible for the operations of this 330 bed acute care campus and level II Trauma Center. Prior to that time, Ms. Willemsen served as Executive Vice President and Chief Operating Officer at Queen of the Valley Medical Center in Napa, California. In addition, Ms. Willemsen held other positions at Queen of the Valley including Vice President for Support and Ancillary Services and Executive Director of Acute Care and Rehabilitation Services.

Prior to her tenure at Queen of the Valley, Ms. Willemsen worked at the Rehabilitation Institute of Chicago as Vice President of Nursing and Allied Health and Assistant Director of Nursing. Ms. Willemsen 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 in Evanston, Illinois.

Executive Compensation Principles

John Muir Health is committed to compensation principles and policies that are fair, reasonable, competitive, and in keeping with government regulations and sound corporate governance practices. Find out more about our compensation philosophy and practice