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Senior Team


Photo of Michael Zimmerman

Michael Zimmerman, Chief Executive Officer

     Michael assumed the helm in December of 2023, bringing a wealth of experience that spans the breadth of healthcare administration. He is a seasoned healthcare visionary with over three decades of transformative leadership in the industry.

     Michael's journey in healthcare began over 35 years ago, with a focus on Long Term Care. His passion for navigating complex challenges led him to a pivotal role as a healthcare consultant for five years, where he honed his skills in addressing multifaceted issues. Transitioning seamlessly into the role of a hospital CEO, Michael has steered organizations ranging from 16 to 299 beds across diverse landscapes, including California, Arizona, New Mexico, and Texas.

     Throughout his illustrious career, Michael has become a trusted guide for organizations grappling with financial, governance, medical staff, and regulatory challenges. His strategic acumen has been a driving force behind the success stories of institutions facing adversity. Despite not being a clinician by profession, Michael's unparalleled experience has uniquely positioned him to lead clinical teams through their own recovery processes, showcasing his remarkable ability to bridge the gap between administrative and clinical realms.

     Beyond the boardroom, Michael is a devoted family man. Married to a Nursing Educator, he understands the intricacies of healthcare from both a professional and personal perspective. With two accomplished adult children, a delightful granddaughter, and a household filled with the warmth of big dogs, Michael brings a holistic approach to his leadership, grounded in a deep appreciation for the human side of healthcare.



Photo Coming Soon of Colleen Choi

Colleen Choi, Chief Operating Officer




Photo of Diahann Barrera

Diahann Barrera, Chief Financial Officer




Photo of Thomas Wilkinson

Thomas Wilkinson, Chief Nursing Officer

     Originally hailing from Williamstown, Vermont, Tom owned a successful small business in the propane industry for over 10 years; designing, installing, and repairing residential, commercial, and industrial propane equipment and systems. Tom decided to change careers and attended nursing school in Ticonderoga, New York.

     He obtained his LPN (LVN) and worked nights as he went to RN school. Tom was the valedictorian of his nursing class and began working in the Emergency Room when he received his RN license. He spent the first three years of his nursing career in Emergency Rooms in Vermont and Upstate New York. Tom and his wife, Rose, arrived in California in December of 2013 and soon decided to relocate permanently.

     Tom served as a RN house supervisor and ER charge nurse at various hospitals over the next few years. He also worked overnights as a Critical Care Transport RN in the Bay Area. Tom obtained his board certification in Emergency Nursing (CEN) in 2012 and board certification in Critical Care Nursing (CCRN) in 2021. He served as the District’s Chief Nursing Officer from 2019 to 2021, when his wife became very ill and he stepped down to concentrate on her recovery.

     Tom obtained his Masters of Nursing (MSN) degree from Capella University in 2020 with a concentration in Leadership/Administration and Education with a 4.0 GPA. He is an accomplished musician and enjoys playing fiddle and piano. Tom is excited to join the leadership team at JCF and looks forward to helping create positive change for the District and needed services for the community.

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