John Deardorff, FACHE

President/Chief Executive Officer

John Deardorff is the President and Chief Executive Officer for Reston Hospital Center and the HCA Northern Virginia market. The Northern Virginia market encompasses Reston Hospital Center, Dominion Hospital, and StoneSprings Hospital Center. In addition to the main hospital campuses, HCA Northern Virginia boasts a larger footprint throughout region providing a number of services in our outpatient centers including multiple CareNow Urgent Care Centers, Fairfax Surgical Center, Reston Surgery Center, the Medical Imaging Center of Reston, the Women’s Imaging Center, and CHOICES Outpatient Services as well as a handful of others.

With more than 20 years of experience in healthcare, John has served in a variety of executive and leadership roles. Prior to joining Reston Hospital Center, he served as the Chief Executive Officer of multiple HCA hospitals in both Florida and Georgia. John received a Bachelor of Science degree from Towson University in Maryland, with a double major in business administration and health services management, and went on to earn his Master of Health Administration degree from George Washington University.

Dustin Fosness

Chief Financial Officer

Dustin Fosness serves as the Chief Financial Officer of the Northern Virginia market for HCA Virginia Health System. Dustin oversees financial operations at Reston Hospital Center, StoneSprings Hospital Center, and Dominion Hospital.

Dustin joined the Northern Virginia team after prior HCA CFO roles at West Florida Hospital (Pensacola, FL) and Terre Haute Regional Hospital (Terre Haute, IN). Dustin began his HCA career in 2015 as the Associate CFO and Vice President of Finance at Henrico Doctors' Hospital. Prior to that role, he served in a variety of finance and accounting positions at Fortune 500 companies in the Richmond area, including Dominion Energy and Anthem, Inc.

A native of Duluth, Minnesota, Dustin graduated from the University of Wisconsin-Superior in 2006 with a Bachelor's in Accounting. He later earned a Master's in Business Administration from the Robins School of Business at the University of Richmond in 2013.

Irene Wiliford, RN, MSN, CNOR, NE-BC

Vice President/Chief Nursing Officer

Irene Williford is the Chief Nursing Officer for Reston hospital and has been in this role since April 2017. In this time she has increased patient experience and satisfaction and has created a Nursing leadership environment second to none. Irene has 35 years in Nursing and previously was the Assistant Chief Nursing Officer since November 2016. She was instrumental in the startup of our Level II trauma center and implemented several cutting edge technology advancements that are now accessible to Reston physicians and their patients, including both da Vinci Xi and Mazor X robotics, as well as the first to market the Mako TKA application.

Prior to assuming the Assistant Chief Nursing role, she was the VP of Surgical Services for Reston Hospital. Irene enhanced the overall operations of surgical services, resulting in improved efficiencies and enhanced staff and physician engagement.

Irene has held various leadership positions in Nursing at several health systems, including positions at INOVA Fairfax and INOVA Fair Oaks in Northern Virginia. Irene is a US Army Nurse Corps retiree of 22 years. She retired from Womack Army Medical Center in Fort Bragg, NC. Assignments to note in the Nurse Corps as an Operating Room Nurse include Walter Reed Army Medical Center, Washington, DC; , Brooke Army Medical Center, San Antonio, Texas; and Dewitt Army Community Hospital, Fort Belvoir, VA.

Irene received her Bachelor of Science in Nursing from Lynchburg College, Lynchburg, VA and her Master of Science in Nursing from the University of Texas at El Paso. She is a Board Certified Nurse Executive (NE-BC) and holds certifications in Lean Six Sigma, and Certified Nurse, Operating Room (CNOR).

Dr. Tom Taghon

Chief Medical Officer

Dr. Thomas Taghon serves as the Chief Medical Officer for Reston Hospital Center, and he assumed this role in December, 2019. Prior to moving to Reston, Tom served as the Associate Chief Medical Officer at Dayton Children’s Hospital in Ohio, where he also served as Chief of Anesthesiology. Tom has held several prior leadership positions including Vice Chairman of Anesthesiology for Quality and Safety at Nationwide Children’s Hospital, President of the Medical Staff, and Program Director for the Pediatric Anesthesiology Fellowship.

Tom earned his B.S in Pharmacy from Butler University, and earned his medical degree from the Ohio University Heritage College of Osteopathic Medicine. He later returned to Ohio University to earn his Master of Health Administration degree, and is a graduate of the Advanced Training Program in Healthcare Quality Improvement at Intermountain Healthcare in Utah.

Tom is Board Certified in both Adult and Pediatric Anesthesiology. He served his Anesthesiology residency at US Naval Hospital, Portsmouth, VA, and a fellowship in Pediatric Anesthesiology at Cincinnati Children’s Hospital Medical Center. He has served in several academic leadership roles including that of Assistant Clinical Professor of Anesthesia and Clinical Pediatrics at Cincinnati Children’s, Assistant Clinical Professor of Anesthesiology at The Ohio State University, and Associate Professor of Pediatrics at Wright State University.

Tom and his wife, Katja Taghon, have two grown children who reside in Fredericksburg, Virginia, and Columbus, Ohio.

Allyssa Tobitt

Chief Operating Officer

Allyssa Tobitt serves as the Chief Operating Officer (COO) of Reston Hospital Center, joining the Reston team in August 2021.  As COO, Allyssa oversees key hospital operations including all construction projects, medical office buildings and Reston Hospital’s Ethics and Compliance program.

Allyssa joined HCA Healthcare in 2012 at the Corporate Office in Nashville, TN where she led various implementations related to service line management initiatives as part of the Clinical Excellence team. In previous roles, Allyssa served as the Vice President of Operations at South Bay Hospital in Sun City Center, FL and the Assistant Vice President of Operations at Aventura Hospital and Medical Center in Miami, FL. Most recently, Allyssa served as the Chief Operating Officer of Doctors Hospital of Sarasota, a 155-bed health care facility and freestanding Emergency Department serving Sarasota and Manatee Counties, located in HCA’s West Florida Division. 

A native of Nashville, TN, Allyssa earned a Bachelor of Science and Masters of Business Administration from Middle Tennessee State University. She has also served on several volunteer community boards that advocate for local businesses and young children.