Our Leadership Team

John McDonald serves as the President and Chief Executive Office at Peterson Health. John began his healthcare career as a Patient Care Technician on a Med/Surg unit at Houston Methodist Hospital. He then held various roles in medical staff services, wound care, and physician practice management before leaving Houston to join Northwest Texas Healthcare System as an Assistant Administrator and later as Chief Operating Officer. For the past decade, he has worked for Healthcare Corporation of America (HCA) as a hospital Chief Operating Officer and Chief Executive Officer.

His exposure to healthcare began at an early age, as his mother, grandmother, and sisters were all nurses. Although he initially planned to become a physician, he fell in love with the business and leadership aspects of the healthcare industry. John believes that working in healthcare provides the privilege of making a significant impact on people’s lives, which he finds personally rewarding.

John was born and raised in Baytown, Texas, and attended Texas A&M University, where he met his wife of 19 years, Jessica. Jessica grew up in Pleasanton, Texas, and they have many relatives in and around San Antonio. They have two daughters: Kate, who is 15 and will be a junior at Tivy High School, and Claire, who is 12 and will be in 7th grade at Peterson Middle School. John enjoys outdoor activities such as hiking, camping, hunting, and fishing, and his favorite food is Texas-style barbecue.

Joe Piszczor currently serves as the Chief Operating Officer (COO) at Peterson Health. He started his career at Sid Peterson Memorial Hospital in 2005. In 2012, Joe accepted a position as Chief Operating Officer at a for-profit hospital in Florida. After returning to Texas and Peterson in late 2013, he is now responsible for several of the professional ancillary departments. Joe also oversees many of the construction projects throughout the organization.

Joe grew up in Chicago and graduated from the University of Illinois-Urbana/Champaign with a bachelor’s degree in community health. He received a master’s degree in healthcare administration from the Texas A&M University School of Rural Public Health, College Station that further cultivated his passion for rural healthcare. Joe is board certified in Healthcare Management and is recognized as a Fellow in the American College of Healthcare Executives (FACHE).

He is married and has three children. His oldest is in the Navy and the two youngest are still at home. The youngest keep him and his wife busy with sports and activities during the week and on the weekends. In his spare time, he enjoys spending time with his family, traveling and being outdoors.

Lisa Medovich became the Chief Financial Officer (CFO) of Peterson Health in June 2015. She is an experienced leader in corporate finance, with more than 35 years working with complex multidimensional healthcare organizations, including public accounting, where she was a Senior Manager in the Healthcare Practice at Ernst & Young, LLP. Lisa came to Peterson Health from Val Verde Regional Medical Center in Del Rio, Texas, where she was CFO. Before 2014, she was at ValleyCare Health System and Forum Health in Northeast Ohio, where her focus as CFO was driving and managing restructuring initiatives, revenue cycle improvements, and acquisition due diligence.

Lisa was raised in Brookfield, Ohio, and earned her BA in Accounting from Youngstown State University. She is a Certified Public Accountant and a member of several professional organizations. She has also held leadership positions on various advisory boards and associations.

Lisa and her family moved to Texas from Ohio in 2014 because her son wanted to attend Schreiner University, where he earned his degree in environmental biology. She enjoys spending time with friends and family, including her husband John, son Josh, and their family pet, CoCo, a chocolate lab.

Kaeli Dressler started out at Peterson Health as a staff nurse on a medical/surgical unit then became a charge nurse and later a nurse manager. She transitioned into a Clinical Information Systems role for a number of years, helping implement the hospital’s first electronic medical record system. Kaeli subsequently returned to a leadership role for several med/surg units. Later, while serving as Associate CNO, she became a member of the new hospital transition team, and then became CNO in 2009.

Kaeli was born in Wisconsin and moved to the Texas Hill Country when she was in middle school, where she grew up on a horse ranch. Kaeli earned an undergraduate degree in Nursing from Angelo State University. After graduating, she moved back to the Hill Country and began her career as a nurse at Sid Peterson Memorial Hospital. She then pursued postgraduate education at UT Health Science Center San Antonio while working at Peterson and graduated with an MSN in 2005.

Having grown up in a very small, rural town, the small towns near Kerrville were just the right size and felt like home. In addition to spending time with her family, Kaeli enjoys riding, driving, and having fun with her horses and other animals.

Brian became the Chief Information Officer (CIO) for Peterson Health in January 2019. He came from Houston, Texas where was serving as the CIO for the Texas division of Catholic Health Initiatives.

His career in Information Technology began in 1990 where he worked as a software support engineer for Universal Computer Systems in Houston, Texas which provided automation to Automobile Dealerships. Brian started supporting Healthcare Information Technology in 2000 when he was the manager of a 250-member Technology Support Center supporting Seton Healthcare in Austin and UTMB in Galveston. Brian took on the role of Director of Information Technology for St. Luke’s Episcopal Healthcare in Houston in 2008. Most notable achievements was the implementation of multiple technologies including the EPIC EMR at 5 Hospitals within the St. Luke’s Episcopal system, which was eventually acquired by Catholic Health Initiatives.

Raised in Port Arthur, Texas, Robicheaux earned his Bachelor of Science degree in Computer Science from Lamar University in Beaumont, Texas.

Dr. Glanton became CMO of Peterson Health in January 2022. He had previously served as Chief of the Medical Staff at Peterson Regional Medical Center from 2020-2021 while in private practice as a nephrologist with San Antonio Kidney in the Kerrville/Boerne offices.

Chris grew up in Marshall, TX graduating from Marshall High School in 1989. He attended the University of Texas at Austin where he graduated with a BA in Biology and Pre-Med in 1993. In May 1993, he accepted the Health Professions Scholarship Program from the US Air Force and attended UT Southwestern Medical School at Dallas from 1993 through May of 1997 when he earned his MD. He graduated with honors as a member of Alpha Omega Alpha. He moved to the South Texas area in July 1997 when he began his internship at Wilford Hall USAF Medical Center, completing his residency in Internal Medicine in June of 2000.

He moved to Washington, DC, for two years with his wife and then twins to complete a 2 year fellowship in Nephrology at Walter Reed US Army Medical Center as the first Air Force physician to do so. He transferred back to Wilford Hall USAF Medical Center in 2002 where he eventually became the Flight Commander of the Nephrology Section of the 759th Medical Operations Squadron, which began his training in leadership. In 2003, he was deployed in support of Operation Iraqi Freedom/Operation Enduring Freedom as a Critical Care Air Transport Team physician team leader flying 20 missions with critically ill patients from areas such as Baghdad, Kuwait City, and Liberia to hospitals at Landstuhl Medical Center in Germany and to Walter Reed in DC. He earned both the Army Achievement Medal as well as the Air Force Commendation and Meritorious Service Medals during his time in active duty.

In 2006 he separated from the Air Force and joined San Antonio Kidney Disease Center Physician’s group as a clinical nephrologist practicing in Stone Oak and Boerne, becoming medical director of the newly constructed dialysis clinic there. He served on the Medical Executive Committee of the group from 2010-2012 and was elected President of the group in 2012 where he served 3 years. He moved his primary practice location to Kerrville in August of 2012 where he also assumed the role of medical director of Davita Kerrville dialysis unit. While attending patients at PRMC he earned a peer recognition award as “Outstanding/Exemplary Practitioner” and in 2020 he received the Leadership award for the annual CALLING values awards on Doctor’s Day. He has participated in several teaching activities, including giving lectures to staff on Hyponatremia, AKI, Evaluation of CKD and Dialysis basics.

He enjoys college football including supporting his Texas Longhorns attending many home and away games as well as attending games at his childrens’ alma maters, Auburn University and University of Arkansas. He golfs as often as he can trying to lower his handicap and enjoys Whitetail deer hunting in South Texas where he has had a lease for 15 years. He enjoys traveling with his wife Melissa and spending time with family and friends and enjoying a good glass of Bourbon or Cabernet Sauvignon. He also enjoys reading the Bible and and non-fiction, particularly presidential history.

Tim started in healthcare more than 30 years ago as a Navy corpsman. He joined Peterson Health in 2013 after serving 13 years as Director of Operation for Austin Regional Clinic. He spent his first 10 years with Peterson Health overseeing operations for Peterson Medical Associates helping grow the team from five physicians to more than 60 physicians and advanced practice providers across several specialty areas. He currently serves as Peterson’s Chief Strategic Development Officer.

Tim is board certified by the Medical Group Management Association and a graduate of the Texas State University Healthcare Administration program. He has served as a Session member of First Presbyterian Church, Board Chair of the Kerrville Area Chamber of Commerce, and on other non-profit Boards. In 2015, he received the Healthcare Leadership Award from the Kerrville Area Chamber of Commerce.

Mrs. Davis was born and raised in Kerrville. After graduating from Tivy High School, she attended Schreiner University. She began her healthcare career with Peterson Health in December 1991, while she worked to complete her academics at The University of Texas Health Science Center, earning her Bachelor of Science in Nursing degree and Board Certification as a Registered Nurse. She later continued her education completing her Master of Business Administration Degree from The University of Texas at Tyler.

Tracy’s nursing career at Peterson Health was marked by her diverse roles and transition into leadership positions. She began as an Emergency Room Nurse, gaining valuable experience that she later applied in Legal Nurse Consulting, Case Management, and started the first Nurse Navigator program for Peterson Health. Her leadership journey continued as she took on roles as a Director, Vice President of Population Health, and currently as the Chief Ambulatory Care Officer, showcasing her ability to adapt and lead in various healthcare settings.

Tracy’s personal connections to Peterson Health run deep, as she and her daughter and granddaughter were born there. This personal bond with the organization underscores her commitment and dedication to the healthcare profession.

Audrey Ducker is a registered nurse and she originally joined Peterson Health in 2003. Audrey has served in her current role of Chief People and Experience Officer since 2023.

She has served in several nursing leadership roles throughout her career, including Chief Nursing Officer at a small rural hospital in Colorado. Audrey is passionate about developing leaders and helping each employee find purpose and meaning in their work. At Peterson Health, Audrey is responsible for creating an optimal experience for patients, families, and employees.

Audrey has a Master’s of Science in Nursing from Texas Tech University, Lubbock, Texas. She and her husband live in the country and enjoy being outdoors and watching sunsets. In her free time, Audrey loves to cook for her family and friends.