Chris Mowan, MBA, FACHE

President and Chief Executive Officer, Medical City Dallas

Chris Mowan joined Medical City Dallas as President and Chief Executive Officer in July 2016. Previously, Chris served three years as CEO of MountainView Hospital, a complex teaching hospital in Las Vegas, Nevada. During his tenure at MountainView, he oversaw a $90 million facility expansion, achieved unprecedented ER growth and launched graduate medical education programs.

Mowan’s career with HCA spans more than 20 years, starting with roots as a Medical City Healthcare division manager to roles as COO at Del Sol Medical Center in El Paso and as COO at Sunrise Medical Center and Children’s Hospital in Las Vegas, which was ranked as the #1 facility in Nevada by U.S. News & World Report under his leadership.

Mowan is a graduate of Indiana University and holds a Master of Business Administration from Southern Methodist University. He is a Fellow of the American College of Healthcare Executives. Mowan lives in Dallas with his wife, Natalie, and two daughters, Chloe, 10, and Ashley, 8.

Jay deVenny, FACHE

Chief Executive Officer, Medical City Children's Hospital and Medical City Women's Hospital Dallas

Jay deVenny, FACHE, was named chief executive officer of Medical City Children’s Hospital and Medical City Women’s Hospital Dallas in January 2022. Previously, he served as chief development officer and vice president of business development at Medical City Dallas since December 2013. He has led development initiatives of services at Medical City Children’s Hospital including a world-class congenital heart program, pediatric oncology, pediatric orthopedics and trauma. In addition, he supported physician partnerships at Medical City Women’s Hospital Dallas. 

Prior to joining Medical City Healthcare, deVenny held several roles in administrative and business development within the North Texas healthcare industry.

deVenny holds a Master of Business Administration in Health Services Management from the University of North Texas and a Bachelor of Science in Communication Studies from the University of Kansas and is a Fellow of the American College of Healthcare Executives (FACHE). He serves as a board member for Camp iHope and the North Dallas Chamber of Commerce.

Joyce Soule, DNP, RN, NEA-BC, CNOR

Chief Nursing Officer, Medical City Dallas

Joyce Soule, DNP, RN, NEA-BC, CNOR, joined Medical City Dallas as Chief Nursing Officer in August 2017 with more than 20 years of nursing experience.

Prior to joining Medical City Dallas she served as Chief Nursing Officer at Wesley Medical Center in Wichita, Kansas, where she also oversaw Wesley Woodlawn, a community hospital, two off-campus emergency departments and hospital-based clinics. Joyce improved patient satisfaction scores, along with reducing-sepsis during her tenure with the organization.

Previously, she was Vice President of Surgical Services at Medical City Dallas and served in director positions at Medical City Arlington and Texas Health Harris Methodist Hurst-Euless-Bedford Hospital.

Soule earned a Master of Science in Nursing Healthcare Administration and a Bachelor in Nursing from Graceland University in Independence, Missouri. She recently completed her Doctor of Nursing Practice (DNP) degree. She is a certified perioperative nurse and holds an advanced nursing executive board certification.

Soule resides with her husband, Greg. They have four adult daughters, three off whom live in the DFW area. They have four granddaughters and two grandsons, all whom reside in the DFW area. When not at work, she enjoys spending time with family and friends.

Tabitha South, MSN, RN, NE-BC

Chief Nursing Officer, Medical City Children's Hospital and Medical City Women's Hospital Dallas

Tabitha South, MSN, RN, NE-BC

Tabitha South, MSN, RN, NE-BC, has served as the Chief Nursing Officer at Medical City Children’s Hospital and Medical City Women's Hospital Dallas since November 2022. She helps lead service lines, including congenital heart, neonatal and pediatric services and women’s services. She also works closely with the chief nursing executive at Medical City Dallas to build cross-hospital partnerships in nursing leadership and the hospital nurse executive council.

South was an Assistant Chief Nursing Officer at Medical City Dallas from April 2022 to October 2022. Before that, she was Assistant Chief Nursing Officer at Medical City Plano since 2017. With her collaborative leadership, Medical City Plano opened the first Sarah Cannon Cancer Hospital tower in Texas, launched the ECMO program, attained numerous service line designations and accreditations, and achieved HCA Unit of Distinction in nine nursing units. She also led the redesignation process for Medical City Plano’s 4th Magnet designation and Medical City Frisco’s 2nd designation.

South is a graduate of the HCA Executive Development Program and has been recognized as a DFW Great 100 Nurse and a recipient of the D Magazine Nurse Excellence Award. She will complete her Doctorate of Nursing Practice (DNP) in December at the University of Texas at Arlington. She earned her Master of Science in Nursing and Bachelor of Science from Texas Tech University and her Associate Degree in Nursing from Collin College.

John Lazenby, MD

Chief Medical Officer

John Lazenby, MD, was named Chief Medical Officer of Medical City Dallas, Medical City Children’s Hospital, Medical City Women’s Hospital, Medical City Heart Hospital and Medical City Spine Hospital in June 2020.

He previously served as CMO of Memorial Hospital in a, Florida. During his tenure, he provided leadership to the medical staff and oversaw several quality, clinical performance and service initiatives throughout the hospital.

Prior to joining HCA Healthcare, Dr. Lazenby spent five years at University of Alabama Birmingham Hospital where he served as Assistant Chief Medical Officer and Associate Professor of Medicine. Prior to joining the team at UAB, he spent 12 years in private practice in both Arkansas and Georgia.

Dr. Lazenby is board Certified in Pulmonary Disease and Critical Care Medicine. He earned his medical degree from the University of Arkansas and a Master of Business Administration from Auburn University. He has served as the Chief Executive Officer of his medical practice as well as the Chief Medical Information Officer of an acute care medical and surgical hospital. He is also a Fellow of the American College of Chest Physicians as well as a member of the American Association for Physician Leadership.

Scott Anderton

Chief Financial Officer

Scott Anderton joined Medical City Dallas as chief financial officer in April 2022. In this role, Anderton oversees finance and accounting functions for Medical City Dallas, Medical City Children's Hospital, Medical City Women's Hospital Dallas, Medical City Heart Hospital and Medical City Spine Hospital.

Previously, Anderton served as CFO of HCA Healthcare's Doctors Hospital in Augusta, Georgia, since July 2020. He joined HCA Healthcare in 2010 as a staff auditor in the Internal Audit department moving into the hospital setting in 2016 as an assistant chief financial officer at HCA Healthcare's CJW Medical Center in Richmond, Virginia. In 2018, Anderton was promoted to chief financial officer of HCA Healthcare's Coliseum Health System, a 413 bed, multi-campus health system in Macon, Georgia.

Anderton holds a Master of Accountancy and a Bachelor of Science in Accounting from the University of Alabama.

Gabby Underwood, MS, BSN, RN, CPHQ

Vice President of Quality and Patient Safety

Gabby Underwood joined Medical City Dallas and Medical City Children’s Hospital as Vice President of Quality and Patient Safety in December 2020.

Underwood has over 25 years of healthcare experience. She previously served as the VP of Quality and Patient Safety at Medical City Fort Worth. There, she led a team who successfully implemented various quality improvement protocols and initiatives during her tenure which have led to vast improvement in quality rankings, metrics and overall patient safety. During her tenure, she achieved many notable accomplishments including: a Leapfrog Grade A Safety Rating for four consecutive quarters – only one in Fort Worth medical district; 14 months consecutively of top decile performance for complications and mortality; successful quality reaccreditation surveys including Comprehensive Stroke Certification, Chest Pain and Spine Surgery; and increased compliance rates for Enhanced Surgical Recovery process in conjunction with surgical services.

Underwood holds a Master of Science in Management from Texas A&M University and a Bachelor of Science in Nursing from the University of Texas at Arlington.

Mary Beth Short

Vice President of Human Resources

Mary Beth Short was named Vice President of Human Resources at Medical City Dallas, Medical City Children’s Hospital, Medical City Women’s Hospital Dallas, Medical City Heart Hospital and Medical City Spine Hospital in July 2021. She brings more than 20 years of human resources experience, including more than 16 years in healthcare human resources to her position.

Short previously served as Vice President of Human Resources at Medical City Arlington, Medical City Alliance and Medical City North Hills. Prior to joining Medical City Healthcare, Mary Beth held human resources leadership positions at Medsynergies, Texas Health and Baylor Health Care System.

Short is a Navy veteran. She earned a Bachelor of Science in Business Studies, Human Resources Management from New Hampshire College and a Master of Business Administration from Texas Woman’s University.

Rick Plunk

Vice President of Operations, Medical City Dallas

Rick Plunk joined Medical City Dallas in May 2004 as Director of Respiratory Care. Throughout his tenure with Medical City Dallas, he advanced to Vice President of Neurosciences in 2007 and to Vice President of Operations in 2010. Plunk joined the Senior Leadership Team in 2010, and has served as Interim Chief Operating Officer multiple times and as Vice President of Operations. He provides oversight for all Medical City Dallas operational departments.

Previously, Plunk served as the Administrative Director for Respiratory Care, Cardiology and Rehabilitation for a Tenet Health Care facility in Dallas, Texas. Plunk earned his Master of Business Administration from Amberton University in 2002.

Neyaz Mohammadi

Assistant Administrator, Medical City Dallas

Neyaz Mohammadi is the assistant administrator at Medical City Dallas since December 2021. 

Previously, she served as a Medical City Healthcare administrative resident since January 2021. During her tenure, she has played an integral part in the analysis and execution of several significant facility and division-wide initiatives and gained valuable experience with strategy, operations, data analytics and business development at Medical City Plano, Medical City Arlington, Medical City Dallas, and the Medical City Healthcare Division Office. 

Mohammadi holds a Master of Science in Health Care Administration from Trinity University. In addition, she holds a Master of Science in Medical Sciences from University of North Texas Health Science Center and a Bachelor of Science in Neuroscience from Trinity University.