Senior Leadership

Dr. John Carlo joined Prism Health North Texas as Chief Executive Officer in 2012. Previously he served as Program Director for the Center for Infectious Disease Research and Policy at the University of Minnesota and served as the Medical Director and Health Authority for Dallas County. Dr. Carlo has over 20 years of service in leadership roles for the American Medical Association (AMA), the Texas Medical Association (TMA), and the Dallas County Medical Society (DCMS).

He currently serves on the AMA’s Council on Science and Public Health and is a member of TMA’s Board of Trustees. He is a past chair for the TMA Councils on Socioeconomics, Science and Public Health, and Legislation. He is also a past president of DCMS. Dr. Carlo served as chair for the Texas Public Health Coalition which was instrumental in the passage of legislation raising the minimum age to 21 for buying tobacco in Texas. He also serves on various study boards and advisory groups, including the CDC-funded project entitled, Improving Black, Indigenous, and Persons of Color (BIPOC) Physician’s Capacity to Address COVID-19; the CDC/NNPHI Health Disparities Technical Assistance Center; and the DFW COVID-19 Seroprevalence Study.

In 2021, Dr. Carlo was awarded the Dr. Max Cole Distinguished Service Award by the DCMS, and in 2015 he was awarded the TMA’s Presidential Award for leadership during the Dallas Ebola crisis. He also received the Distinguished Service Award from Parkland Health for his role during Dallas’ support for Hurricane Katrina evacuees. Dr. Carlo received his Medical Degree from U.T. Southwestern in Dallas and completed a residency in General Surgery at Baylor University Medical Center in Dallas. He received his Master’s and Bachelor’s Degrees in Biomedical Engineering from Tulane University.

Dr. Hays grew up in Iowa and then relocated to Arkansas with his family while he was in high school. He later attended the University of Arkansas for his undergraduate studies and received a Bachelor of Science degree in Education with an emphasis in Athletic Training. He is currently Board Certified in Athletic Training and also licensed in the State of Texas as an Athletic Trainer. He attended California University of Pennsylvania and received a Master’s Degree in Exercise Science with an emphasis in Performance Enhancement and is certified as a Performance Enhancement Specialist through the National Academy of Sports Medicine.

Dr. Hays attended Medical School at Ross University School of Medicine and completed his residency training in Family Medicine at the University of Arkansas for Medical Sciences Regional Programs in Fayetteville, Arkansas. He is an avid HOGS fan, and his interests include HIV Medicine, Sports Medicine, along with Wellness and Primary Care Medicine.

Kimberly joined Prism Health North Texas in 2019 and serves as Vice President of Legal Affairs and Compliance.  She oversees Prism Health’s compliance & ethics program, including grants, regulatory, and HIPAA compliance.  She also manages Prism Health’s legal affairs coordinating outside counsel, investigations and contracting.  Kimberly also supports Prism Health’s Inclusion, Diversity, Dignity, Equity and Action (IDDEA Initiative).

Kimberly has over 15 years of experience in the healthcare industry, including serving as Compliance Officer at a specialty pharmacy and medical device company and as a hospital administrator at an academic medical center.  She has also worked with several faith-based and community organizations to address issues around health inequities, access, and stigma in minority communities.

Kimberly earned a bachelor’s degree in Business Administration from Florida A&M University and a law degree from Washington University in St. Louis.

Karin Petties joined Prism Health North Texas in 2015. As the Executive Vice President for Administration, she works closely with the CEO and Senior Leadership to ensure strong process synergy among the many domains and areas of the organization. She oversees the critical and highly diverse functions of grants, community engagement, marketing, development public relations, and policy and supports the CEO in his efforts towards developing strategic partnerships, community mobilization, and public health.

Her prior experience includes various positions within the public health sector over the past thirty years, predominantly focused on the implementation of state and federally-funded projects serving individuals impacted by HIV/AIDS.

Most recently she spent nine years managing federal and state grants as the Assistant Director of Ryan White Grant Compliance with Dallas County, where she had oversight of a 20-million-dollar grant portfolio that supported HIV care services in Dallas and eleven surrounding counties.