Medical Staff  

Chief of Staff and Vice Chief of Staff

Chief of Staff - Ann Weinacker, MD

Ann Weinacker was elected Vice Chief of Staff of Stanford Hospital and Clinics in 2010 and is now Chief of Staff. Dr. Weinacker has extensive experience in SHC clinical and administrative leadership, in addition to serving since 1999 as a fulltime faculty member in the Stanford University School of Medicine. She is currently Associate Professor of Medicine, Division of Pulmonary and Critical Care Medicine, and Associate Director of the Intensive Care Unit. A strong advocate for patient centricity, Dr. Weinacker in November 2009 was appointed one of six leaders designated to actively design, guide and implement strategies to improve the patient experience at Stanford. Her research focus is ICU outcomes.

Weinacker began her career as a nurse and nurse anesthetist before completing her M.D. at the University of South Alabama College of Medicine, Mobile, in 1986. Her advanced training includes a pulmonary and critical care fellowship and a cardiovascular postdoctoral research fellowship, completed at the University of California, San Francisco in 1994. She is the winner of numerous national honors, editorial posts. Locally, she received the SHC Board of Hospital Director’s coveted Denise O’Leary Award for Clinical Excellence in 2008.


Vice Chief of Staff - Mark Welton, MD

Mark Welton was elected Vice Chief of Staff of Stanford Hospital and Clinics in 2011 and is in line to become Chief of Staff in 2014. He has been serving since 2001 as a fulltime member in the Stanford University School of Medicine. He joined the faculty as Associate Professor of Surgery and Chief of Colon and Rectal Surgery.  He initially became interested in leadership through Joe Hopkins’ leadership course for mid-level physicians, where he also met and began working with Ann Weinacker.  He subsequently took a two-week course in leadership for mid-career physicians and ultimately completed a two-year Masters program in Health Care Management at Harvard in 2009. In that two-year program he studied what busy clinicians need to understand so that they may work effectively with hospital administrations as we all try to improve patient care in busy academic medical centers. While acquiring that degree, he accepted the position of Interim Medical Director for the Clinical Cancer Center in April 0f 2008.  He served in that capacity until July 2010.  While serving as Interim Medical Director he led the initiative to win the Blake Wilbur space for the Cancer Center.  He then created the business proposal for the Women’s Cancer Center.  Working in concert with Deena O’shea, he developed the concept of the Disease Management Group reorganization of patient care delivery in the Cancer Center that was ultimately launched by Ms. O’shea, Sri Seshradi and Dr. Welton in April 2010.  In 2006 Dr. Welton initiated the Surgical Quality Council with Kevin Tabb and served as Co-Chair with John Morton until accepting the position as Interim Medical Director of the Clinical Cancer Center.  He also served as UBMD for E3 until he assumed the Cancer Center duties and has reassumed those duties since January 2010.

Dr. Welton received his MD and completed his surgical residency at UCLA before completing a fellowship in Colon and Rectal Surgery at Washington University.  He joined the faculty at UCSF where he became interested in anal cancer prevention through early diagnosis and treatment of anal dysplasia.  He is recognized as the international surgical leader in this field and he continues mentoring residents and fellows in research efforts regarding this topic.

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