HealthONE Leadership

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. A dedicated community servant, Sylvia was awarded “Outstanding Women in Business” in Healthcare and “Most Admired CEO” by the Denver Business Journal both in 2019.


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 is a native of New Orleans 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 is a board-certified family practitioner.

Ryan Thornton
Chief Nursing Executive

Ryan Thornton was named the HealthONE and HCA Healthcare Continental Division Chief Nursing Executive in August 2020. Ryan is an Air Force veteran, where he received awards and honors as a captain.

Suzanne Kelly
Regional Vice President, Human Resources

Suzanne currently serves as the Regional Vice President of Human Resources for the Continental Division. In this role she is responsible for leading all facets of human resources for the Division’s 14,000 + employees.


Hospital Leadership

North Suburban Medical Center

Hollie Seeley
President & CEO

Nathan Esparza
Chief Financial Officer

Vernon Naake, MD
Chief Medical Officer

Michael Hansen, MSN, RN, NE-BC
Chief Nursing Officer

Tonzia Buor
Vice President, Human Resources

Presbyterian/St. Luke’s Medical Center & Rocky Mountain Hospital for Children

Maureen Tarrant
President & CEO

Brett Matens
Chief Operating Officer

Reginald Washington, MD, FAAP, FACC, FAHA
Chief Medical Officer

Phillip Sensing
Chief Financial Officer
Presbyterian/St. Luke’s

Shari Collier
Chief Financial Officer
Rocky Mountain Hospital for Children

David Leslie
Chief Nursing Officer
Presbyterian/St. Luke’s

Amanda Veit
Chief Nursing Officer
Rocky Mountain Hospital for Children

Rose Medical Center

Casey Guber
President & CEO

Michael Hanson
Chief Operating Officer

Deborah Hart
Chief Financial Officer

Laura Thornley
Chief Nursing Officer

Andrew Weinfeld, MD
Chief Medical Officer

Paul Santanello
Vice President, Human Resources

Sky Ridge Medical Center

Kirk McCarty, RN, MSN, NEA-BC
President & CEO

Alan Qualls
Chief Operating Officer

Craig Sammons
Chief Financial Officer

Eric Lung, MD
Chief Medical Officer

Angie Voigt
Chief Nursing Officer

Swedish Medical Center

Ryan Tobin
President & CEO

Karl Leistikow
Chief Operating Officer

Regina Ramazani
Chief Financial Officer

Jaya Kumar, MD
Chief Medical Officer

Linda Gray, RN, MHA, NEA-BC
Chief Nursing Officer

Dena Schmaedecke
Vice President, Human Resources

The Medical Center of Aurora, Centennial Hospital, & Spalding Rehabilitation Hospital

Ryan Simpson
President & CEO

Hallie Woods
Chief Operating Officer

Bryce Dehaven
Chief Financial Officer

Phil Stahel, MD, FACS
Chief Medical Officer

Katie Weihe
Vice President, Human Resources

Tyler Hood
Chief Administrative Officer
Centennial Hospital

Cindy Meyer, MSSW
Chief Operating Officer
Behavioral Health Services