Sylvia Young

President and Chief Executive Officer

Sylvia Young, a dedicated veteran of hospital administration since 1985, was appointed president and chief executive officer of HealthONE and the HCA Healthcare Continental Division in June 2012. From 1998 to 2007, Sylvia served as chief executive officer of The Medical Center of Aurora and Centennial Medical Plaza. From 1995 to 1998, Young served as chief operating officer of HealthONE’s The Medical Center of Aurora.

A dedicated community servant, Sylvia serves on a host of local non-profit boards and organizations. She was awarded “Outstanding Women in Business” in Healthcare and “Most Admired CEO” by the Denver Business Journal both in 2019.

Sylvia earned a master’s degree in health administration from the University of Alabama, Birmingham and a bachelor’s degree in public administration from Samford University in Birmingham.


Greg D’Argonne

Chief Financial Officer

Greg D’Argonne has served as the chief financial officer of HealthONE and the HCA Healthcare Continental Division since 2001. Greg joined HCA Healthcare in 1984 and served as the assistant controller at Parkland Hospital in Baton Rouge, LA and controller at North Monroe Hospital in Monroe, LA.

Greg is a native of New Orleans and earned his Bachelor of Science degree in accounting from Louisiana State University, and is a certified public accountant.


Dr. Gary Winfield

Chief Medical Officer

Gary Winfield, MD was appointed HealthONE and HCA Healthcare Continental Division chief medical officer in November 2013. Dr. Winfield leads clinical and quality initiatives supporting consistent high-quality clinical performance and practice standards across HealthONE hospitals in Denver.

Prior to joining HealthONE, Dr. Winfield served as chief medical officer for Lewis-Gale Regional Health System, and also held a number of roles at Memorial Hospital in Jacksonville, FL. While at Memorial Hospital, Dr. Winfield conceived the concept of obtaining a first-of-its-kind Joint Commission disease-specific certification for sepsis.

Dr. Winfield is a board-certified family practitioner and operated a private practice in Jacksonville, FL for a number of years. He completed his postdoctoral training in family practice at St. Vincent’s Medical Center in Jacksonville, FL. Dr. Winfield received his medical degree from the University of Oklahoma Health Sciences Center in Oklahoma City, OK.


Ryan Thornton

Chief Nursing Executive

Ryan Thornton was named the HealthONE and HCA Healthcare Continental Division Chief Nursing Executive in August 2020. Prior to being named, Ryan served as the chief nursing officer at Swedish Medical Center. He also held nursing leadership roles as CNO at Ashley Regional Medical Center in Vernal, Utah, ACNO at Rose Medical Center, and several others leadership positions in the United States Air Force. After serving in the Air Force for over eight years as both an enlisted member and an officer, Ryan separated from the service with myriad awards and honors as a captain.

Ryan earned a Bachelor of Arts in kinesiology, a Bachelor of Science in nursing, and a Master of Arts in physical education all from the University of Northern Colorado and completed his Master of Business Administration from the University of Colorado. Ryan is also a graduate of the HCA Healthcare Executive Development Program.