Skip to Content


At HCA Houston Healthcare Kingwood, our experienced and knowledgeable leadership team is committed to improving the quality of care and helping our community.

John Corbeil

Chief Executive Officer

John Corbeil joined HCA Houston Healthcare Kingwood as chief executive officer (CEO) in January 2019. He previously served as chief operating officer of Medical City Fort Worth, an HCA Healthcare affiliated hospital in Fort Worth, Texas, for three years. Corbeil also held multiple executive leadership roles in HCA Healthcare's North Texas Division, including associate chief operating officer at Medical City Dallas, assistant administrator for Medical City Fort Worth, and administrative fellow for the North Texas Division Office. John joined HCA Healthcare in May of 2012.

Corbeil earned both his bachelor's degree in business administration and his master's degree in health administration from the University of Iowa. He is a member of the American College of Healthcare Executives and Leadership North Texas. He is also a board member of The University of Iowa's College of Public Health and The Lake Houston Chamber of Commerce, which is focused on community involvement, economic development, and city planning.

Ahmad Maarouf

Chief Medical Officer

Ahmad Maarouf, MD, was appointed as chief medical officer (CMO) at HCA Houston Healthcare Kingwood in October 2022. In his role, Dr. Maarouf is responsible for ensuring high quality, patient-centered care through clinical and quality initiatives that support the provision of consistent clinical performance and practice standards across the hospital.

Dr. Maarouf comes to HCA Houston Healthcare Kingwood from HCA Houston Healthcare Northwest, where he served as CMO and was instrumental in elevating care at the hospital through his close work with physicians and clinical staff. Before his tenure with HCA Houston Healthcare, Dr. Maarouf served in numerous medical directorships and chairmanships with Beaumont Health - Trenton. He has also held positions as clinical assistant professor at Michigan State University and associate program director for the Internal Medicine Residency Program at Beaumont Health – Trenton. He also served as an advisory board member for LifeGift.

Dr. Maarouf received his medical degree from Damascus University College of Medicine and completed his residency in internal medicine at Western Reserve Care System/Forum Health. He completed a nephrology fellowship and a critical care fellowship at the University of Pittsburgh Medical Center. He holds an MBA from Case Western Reserve University. Dr. Maarouf is board certified in internal medicine, nephrology and critical care.

Joel North

Chief Operating Officer

Joel North was appointed Chief operating officer (COO) at HCA Houston Healthcare Kingwood in August 2020. In his role, he is responsible for ensuring consistent department and service line strategy alignment as well as hospital facility initiatives, including construction, new equipment, quality improvements, efficient utilization, and the overall care environment of the facility.

North joined HCA Healthcare in 2018. He served as assistant administrator of HCA Houston Kingwood since 2019. He also served as assistant administrator and administrative resident at Cypress Fairbanks Medical Center Hospital.

A native Houstonian, North earned his bachelor of arts in medical humanities and a master’s of business administration with a specialization in healthcare from Baylor University. He is a member of the American College of Healthcare Executives and a board member of the Greater East Montgomery County Chamber of Commerce.

Virgil Winslow

Chief Finacial Officer

Virgil Winslow joined HCA Houston Healthcare Kingwood as the chief financial officer (CFO) in May 2016. Previously, he served as the CFO at Texas Orthopedic Hospital from 2014 - 2016. Winslow entered the position of Controller in 2010 at HCA Houston Healthcare Clear Lake before assuming the role of Assistant Chief Financial Officer where he fulfilled the duties of the financial officer on-site at the HCA Houston Healthcare Mainland campus.

Winslow began his 16-year history with HCA Healthcare in February 2000 as Staff Accountant at Capital Medical Center in Olympia, WA. While at Capital Medical Center, he was promoted to assistant controller within 3 months of employment and eventually took on the role of Controller. In September 2005, Winslow and his family made the move to the Houston area where he was offered the controller position at Spring Branch Medical Center.

Winslow graduated from South Puget Sound Community College in Olympia, WA where he earned his associates in technical arts degree in computer programming. He then went on to receive his bachelor of science degree in accounting from the University of Tampa in Tampa, FL.

Darren DeSimone

Chief Nursing Officer

Darren DeSimone, MBA, BSN, RN, was appointed chief nursing officer (CNO) in February 2023. He previously served as interim CNO of HCA Houston Healthcare Kingwood. As CNO, he is responsible for overseeing and coordinating each nursing department and its daily operations.

Prior to joining HCA Houston Healthcare Kingwood, DeSimone worked as director of emergency medicine at HCA Houston Healthcare Conroe. He has over 18 years of nursing experience and started his career with HCA Houston Healthcare as a nurse technician. He went on to serve in various nursing and nurse management positions in emergency services at HCA Houston Healthcare Conroe.

DeSimone earned his nursing degree from Lone Star College and went on to receive a Bachelor of Science in Nursing from the University of Texas at Arlington. He received a Master of Business Administration from Western Governors University. He is a former recipient of the HCA Healthcare Frist Humanitarian Award for his volunteer work in his community as well as in Central America.