Chandler Regional Medical Center - Executive Leadership

President, Dignity Health East Valley 

Mario Garner, EdD, FACHE, is the president of Dignity Health East Valley, which includes Chandler Regional Medical Center, Mercy Gilbert Medical Center, and Arizona General Hospital—Mesa. Before joining Dignity Health, Mario was president of St. Luke’s Health - The Vintage Hospital, a CommonSpirit Health hospital in Houston, Texas. He also served as chief operations officer for Memorial Hermann Health System in CommonSpirit's Southeast Market.

Mario holds a doctorate of education from the University of Houston, a master of healthcare administration from Tulane University and a bachelor of science in microbiology from Louisiana State University. He is a member of the American College of Healthcare Executives, the National Association of Health Service Executives, and the Association for University Programs in Healthcare Administration board. 

Chief Operating Officer (COO)

Jeff McBee is the Chief Operating Officer (COO) for Dignity Health Chandler Regional Medical Center and Mercy Gilbert Medical Center.

Prior to his position with Dignity Health, Jeff served as Administrator of Rust Medical Center at Presbyterian Healthcare Services in New Mexico. He previously served in various leadership roles in hospital operations and supply chain at Maricopa Integrated Healthcare System, Phoenix; Parkland Hospital, Dallas, Tex., Duke University Health System, Durham, NC, and Guthrie Healthcare System in Sayre, Pa.

Jeff received his bachelor’s in psychology, master’s of health administration, and master’s of business administration from the University of Missouri-Columbia.

Chief Medical Officer

Erik Mattison, MD, FACEP is the chief medical officer for Dignity Health Chandler Regional Medical Center, and serves as the Associate Designated Institutional Officer for the Graduate Medical Education program.

Since 2004, Dr. Mattison has practiced as an Emergency Medicine physician at Chandler Regional Medical Center and Mercy Gilbert Medical Center . He has served as the Medical Director at Chandler Regional’s Emergency Department, Department Chairman of the Emergency Department at both Chandler Regional and Mercy Gilbert and as the President-elect of the Medical Staff for Chandler Regional and Mercy Gilbert. Dr. Mattison has served on numerous hospital quality and safety committees including serving as chair of the Medical Staff Quality Committee. He is board certified in both Emergency and Addiction Medicine.

Dr. Erik Mattison completed his undergraduate biology degree at the University of Michigan with High Honors. He attended Case Western Reserve Medical School in Cleveland, Ohio. Dr. Mattison then moved to the Southwest for his Emergency Medicine training at Maricopa Medical Center in Phoenix, Arizona.

Chief Medical Officer

Dr. Yagnesh Patel is the Chief Medical Officer for Dignity Health East Valley hospitals and the Arizona market, which includes Chandler Regional Medical Center and Mercy Gilbert Medical Center. In 2015, Dr. Patel joined the executive leadership team at Chandler Regional and Mercy Gilbert Medical Centers as Vice President of Medical Affairs. In this role, Dr. Patel was responsible for daily operations surrounding quality, risk, patient safety and medical management.

He has been associated with Dignity Health since 1996 when he joined the medical staff as an internist. Dr. Patel transitioned to hospital medicine in 1998 and has been a hospitalist at both Chandler Regional and Mercy Gilbert Medical Centers where he served as Chairman of the medicine and family practice departments and then medical staff president in 2014-2015.

Dr. Patel earned his medical degree from the University of Nairobi in Kenya and after practicing emergency medicine in Kenya, he immigrated to the United States in 1992. Dr. Patel completed his residency in internal medicine at the Catholic Medical Centers of Brooklyn and Queens, NY before moving to Arizona. He is board certified in internal medicine with a focused practice in hospital medicine and hospice and palliative medicine.

Chief Nursing Officer

Niusha Hinz serves as the chief nursing executive officer for Dignity Health Chandler Regional Medical Center. With more than 15 years of nursing experience, she has a strong clinical foundation built through her work in telemetry services, with specializations in neurology, neurosurgery, and cardiothoracic care.

Prior to joining Dignity Health, Niusha began her nursing career at Honor Health Scottsdale Osborn Medical Center. She is committed to building high-performing teams and fostering a culture of accountability and innovation, with humankindness serving as a guiding principle in organizational success. She is deeply committed to advancing patient outcomes, serving as an advocate for patient experience, and fostering a culture where employees feel supported, engaged, and empowered to deliver exceptional care.

Niusha holds a Bachelor’s degree in Journalism from the University of Arizona and a Master’s degree in Nursing from Grand Canyon University.

Vice President of Operations

As Vice President of Operations, Brian oversees a variety of clinical and support departments at both Chandler Regional and Mercy Gilbert Medical Centers and serves on strategic and service line growth initiatives including general surgery, neurosurgery and thoracic surgery. Brian also is the executive for major construction projects at both hospitals. Past and current projects include Chandler Regional Medical Center’s Tower D (2021), Graduate Medical Improvements (2023), and the 5th Floor nursing unit, Endoscopy, Hybrid OR and Cath Lab Expansions (2025) and at Mercy Gilbert Medical Center, the Women’s and Children’s Pavilion, a unique partnership between Dignity Health and Phoenix Children’s Hospital slated to open in 2026.

Prior to his current role, Brian served for nearly 11 years as the  Director of Radiology at Chandler Regional Medical Center.  During his tenure, Brian oversaw expansion of imaging services to support the growing center, including the addition of trauma, growth of neurosurgery and  support of the expansion of high risk OB delivery. In addition, Brian worked to expand imaging  capabilities and update current systems to the latest in new technology, adding 3T Digital MRI,  advanced Interventional Radiology and fully digital x-ray imaging. Brian got his start in  healthcare in the US Army as a Radiologic Technologist (Radiology Specialist) and still holds  his registry today. Upon conclusion of service, Brian worked first as a technologist and began progressing through leadership positions to where he is today. Brian holds a Bachelor of Arts in  Management and Organizational Development from Fresno Pacific University and a Master of  Health Administration from the University of Phoenix. 

Chief Financial Officer

John Bauer is the chief financial officer for Dignity Health East Valley. He provides financial oversight and assistance in meeting financial and strategic goals for Chandler Regional Medical Center, Mercy Gilbert Medical Center, and Arizona General Hospital—Mesa.

John has held various positions of increased responsibility including Accountant at Chandler Regional and Mercy Gilbert, as well as Senior Financial Analyst and Accounting Manager. He was Director of Accounting and Reporting for Dignity Health in Arizona, and Director of Financial Operations at Dignity Health St Joseph’s Hospital and Medical Center in Phoenix.

John received his bachelor’s degree in accounting from Illinois State University and master’s degree in business administration from W.P. Carey School of Business at Arizona State University.