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Executive Leadership

Meet the executive team at Dignity Health Mercy Gilbert.




Roger Bies, M.D.

Chief Medical Officer

Roger Bies, M.D., F.A.C.C., F.S.C.A.I.
Chief Medical Officer, Mercy Gilbert and Chandler Regional Medical Centers

As Chief Medical Officer for Mercy Gilbert and Chandler Regional, Dr. Bies acts as liaison between doctors and healthcare executives, to ensure patients receive the highest quality treatment. His role includes evaluating, and managing physicians on the medical staff and working to implement high quality, cost-effective, efficient medical therapies. Chief Medical Officers have the primary responsibility of managing their health organization’s doctors to provide safe, effective medical services to the public. In his role Dr Bies helps guide the entire healthcare team to implement valid action plans, and organize the financial, human resources, legal, and political aspects of healthcare with goal-oriented visioning for quality assurance. He currently serves as the Accountable Executive for all Research activities at both hospitals.

Prior to assuming this current position as CMO in 2016, Dr. Bies worked as an Interventional Cardiologist with Central Arizona Heart Specialist. He has 25 years of leadership experience as Executive Director of Heart Health Organization, Cardiovascular Dept. Chair, Cath Lab Director, and Faculty and Associate Director of Cardiology at University of Colorado Health Sciences Center. Dr Bies is an active teacher and writer, and has authored over 50 journal articles, books, abstracts, and monographs in medical sciences during his career.

Dr. Bies received his undergraduate degrees in Chemistry and Biology from the University of Colorado, and subsequently graduated with Honors from the University of Colorado Health Sciences Center. He completed his internship and residency at the University of Pittsburgh, Presbyterian University Hospital, and his Cardiology Fellowship & interventional training at Baylor College of Medicine, in Houston, Texas. 

Maryann Bowersox, DNP RN

Chief Nursing Officer

Maryann Bowersox, DNP RN is the Chief Nursing Officer for Mercy Gilbert Medical Center. She is a registered nurse with 34 years of progressive responsibility as a health care leader, with proven ability to manage all aspects of nursing. Clinical, managerial, and leadership experience in quality and safety improvements, staffing, customer service and patient experience, budget and productivity. Demonstrated ability and commitment to building collaborative teams to achieve strategic goals.