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Executive Leadership

Meet the executive team at Dignity Health Mercy Gilbert. 

Mark Slyter Chief Executive Officer

Mark F. Slyter, DSc, FACHE

President and CEO, Mercy Gilbert and Chandler Regional Medical Centers

Mark served as president and chief executive officer for General Health System, in Baton Rouge, La., a three-hospital system with 686 beds, two regional-referral and academic-medical-center campuses, a rehabilitation facility, and clinics. During his tenure, Baton Rouge General Mid-City Hospital transformed into a post-acute specialty campus, improved operating margins, reduced costs, and achieved high patient-satisfaction and employee-engagement scores.

Prior to joining General Health System, Mark was president and chief executive officer at Mississippi Baptist Health Systems, in Jackson, Miss., where he enhanced operating margins and efficiencies while dramatically increasing patient satisfaction. Mark has served in health-care administration since obtaining a master's degree in health services administration at the University of Kansas in 1996. Last year, he obtained a doctorate of science in health services administration from the University of Alabama at Birmingham.


Roger Bies, MD 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. 


Meredith Hestand, MSN, MBA Chief Nursing Officer

Meredith Hestand, MSN, MBA, is the chief nursing officer for Dignity Health Mercy Gilbert Medical Center.


In her role, Hestand’s leadership ensures consistent and high-quality standards of patient-centered nursing care. She manages all nursing resources; develops nursing policies and programs to comply with established standards; and implements long-term strategic goals and objectives for the organization.

With more than 22 years of nursing experience, Hestand is a proven nurse leader who is passionate about quality patient care and devoted to patient safety. Throughout her tenure at Dignity Health, Hestand has been instrumental in implementing high-reliability efforts; improving patient, provider, and employee satisfaction; and leading growth and development efforts for our Maternal Child Health program.

Hestand joined Dignity Health Chandler Regional Medical Center in 2004 as a staff nurse in Labor and Delivery. She was quickly promoted to clinical supervisor and fulfilled that role for seven years before leaving to manage Dignity St. Joseph’s Hospital and Medical Center’s labor care areas. Hestand returned to Chandler Regional in 2014 as director of Maternal Child Health; and served as senior director of Maternal Child Health for both Chandler Regional and Mercy Gilbert from 2017 to 2020.

With a Master of Science in Nursing and Business Administration, Health Care Management, Hestand is currently working on obtaining a doctorate of nursing practice from Walden University. She holds numerous certifications, including a Nurse Executive Board Certification from the American Nurses Credentialing Center and a Graduate Certificate in Clinical Ethics from the Alden March Bioethics Institute. She’s been nominated twice for the Arizona March of Dimes Nurse of the Year and was honored with Dignity Health’s Acts of Humankindness Awards in 2016 and 2017.