TMF Board

TMF Board of Trustees

The board of trustees is comprised of physicians, non-physicians and consumer (Medicare) beneficiary representatives.

For more information regarding TMF’s corporate mission and governance structure click here.

John C. McDonald, DO, FACOI - Chair

Photo of John C. McDonald, DODr. McDonald practices medicine in Longview, Texas. He earned his medical degree in 1993 from Nova Southeastern University, College of Osteopathic Medicine in Davie, Florida. Dr. McDonald is president of the Texas Osteopathic Medical Association Board of Directors.

Dr. McDonald has served on the TMF board since 2013.

Gary W. Floyd, MD - Vice Chair

Gary W. Floyd, MDDr. Floyd is a pediatrician with the John Peter Smith Health Network in Fort Worth. He earned his Doctorate of Medicine at the University of Texas Medical Branch – Galveston. He is a Diplomate at the American Board of Pediatrics and a Fellow at the American Academy of Pediatrics. Dr. Floyd is a delegate to the Texas Medical Association and a member of the board of directors for the Tarrant County Medical Society.

Dr. Floyd has served on the TMF board since 2015.

James Humphrey, CPA - Secretary/Treasurer

Photo of James HumphreyMr. Humphrey is a certified public accountant and licensed financial planner in Houston, Texas. He is a member of the American Institute of Certified Public Accountants as well as state and local CPA societies. He was educated at Texas Southern University in Houston, Texas, and earned his CPA in 1973.

Mr. Humphrey has served on the TMF board since 2013.

Timothy Graves, MSSW - Chair of the Operations Committee

Photo of Timothy GravesMr. Graves has extensive health care management experience, having recently retired from his position of president and CEO of the Texas Health Care Association, the statewide nursing home association. Prior to that time, he held a number of increasingly responsible positions for the Texas Health & Human Services Commission, including associate commissioner for Budget and Support Services and deputy commissioner, chief of staff.

Mr. Graves has served on the TMF board since 2014.

Marilyn Pattillo, PhD, RN - Officer-at-Large

Photo of Marilyn Pattillo, PhD, RNDr. Pattillo is an associate professor in Clinical Nursing at The University of Texas at Austin School of Nursing. She earned certification as gerontological nurse practitioner, adult nurse practitioner, and clinical specialist in Gerontological Nursing. Dr. Pattillo served for 27 in the United States Air Force Reserve Nurse Corps, retiring in 1998 having achieved the rank of Colonel.

Dr. Pattillo has served on the TMF board since 2013.

Gayle Lucas Semtner, M.Ed - Officer-at-Large

Photo of Gayle SumtnerMs. Semtner will represent Medicare beneficiaries. Ms. Semtner has served as the Community Development Specialist for the Oklahoma Health Aging Initiative at the University of Oklahoma Health Sciences Center, and as program Manager for the Aging and Disabilities Resource Consortium with the Aging Services Division of the Oklahoma Department of Human Services. She currently volunteers for the 2017 Juliet Low Leadership Society, Girl Scouts of Western Oklahoma, and the Ladies of Grace Conference at Christ the King Roman Catholic Church. She has served on the boards of six other cultural and arts organizations in Oklahoma. Ms. Semtner holds a Master of Education from the University of Central Oklahoma.

Ms. Semtner has served on the TMF board since 2017.

J. Nile Barnes, Pharm.D., BCPS

J. Nile Barnes, Pharm.D., BCPSDr. Barnes is a Clinical Assistant Professor in the College of Pharmacy at The University of Texas at Austin. He is board certified as a Pharmacotherapy Specialist as well as a Pharmacist Immunization Provider/Instructor. He is also certified as an instructor in Advanced Cardiac Life Support, Pediatric Advanced Life Support and Basic Life Support.

Dr. Barnes has served on the TMF board since 2015.

Dee Margo, BA

Photo of Dee MargoMr. Margo is board president of the El Paso Independent School District. He is a former member of the Texas House of Representatives and worked for more than 30 years for the John D. Williams Company, where he held the position of CEO. He also serves on the Texas Higher Education Coordinating Board Strategic Planning Commission and as a member of the Young Presidents Organization and the World Presidents Organization, served on their international boards. Mr. Margo serves on many local community groups, including the El Paso Chamber of Commerce and is the president of Operation Noel, a 501c(3), which provides 19,000 coats to children from toddlers to age 12 at Christmas.

Mr. Margo has served on the TMF board since 2014.

Kevin H. McKinney, MD

Photo of Kevin McKinneyDr. McKinney is as associate professor of internal medicine, Division of Endocrinology and Stark Diabetes Clinic, at The University of Texas Medical Branch at Galveston (UTMB). He earned his Doctorate of Medicine at UTMB. He is a diplomate in endocrinology, diabetes, internal medicine and metabolism with the American Board of Internal Medicine. Dr. McKinney is a delegate to the American Medical Association and has served in numerous leadership positions on local, state and national medical organizations.

Dr. McKinney has served on the TMF board since 2016.

Melissa Rowan, MSW, MBA

Photo of Melissa RowanMs. Rowan is a healthcare consultant from Austin, Texas, with 20 years of experience working with private and governmental clients on healthcare and social service policy. Her career has focused on federal and state health policy analysis, Medicaid managed care and program development, and implementation and evaluation of programs for special populations. She serves as the vice chair of the Texas Health and Human Services Behavioral Health Integration Advisory Committee.

Ms. Rowan has served on the TMF board since 2014.

Erick Santos, MD, PhD

Photo of Erick Santos Erick Santos, MD, PhD. Dr. Santos, of Corpus Christi, is CEO and owner of South Central Texas Bone and Joint Center, a general orthopaedic surgery and medical consulting practice. He earned his Doctorate of Medicine at the University of Pennsylvania School of Medicine and his PhD in engineering and applied science, focusing on bioengineering, biomaterials and tissue engineering, also at the University of Pennsylvania. He is a board-certified general orthopaedic surgeon and is trained in advanced trauma life support. Dr. Santos is also a diplomate of the American Board of Orthopaedic Surgery and a fellow of the American Academy of Orthopaedic Surgeons. He has served as a flight surgeon and Captain in the U.S. Air Force Medical Corps.

Dr. Santos has served on the TMF board since 2016.

Russ Stromberg, MBA

Photo of Russ Stromberg, MBAMr. Stromberg is a Medicare beneficiary. He enjoyed a long and successful career at Centinela Valley Health Services in Ingelwood, California, receiving citations and accolades from his peers and community. He negotiated the sale of the hospital system in 1996. He recently moved from Austin to Moorpark, California.

Mr. Stromberg has served on the TMF board since 2013.

Michael P. Sullivan, MBA, CPA

Photo of Michael P. Sullivan, MBA, CPAMr. Sullivan is a certified public accountant and the current CEO of the Community Health Center of Lubbock, a federally funded primary health center. He held the positions of CFO and COO before becoming CEO. Mr. Sullivan believes in continuous quality improvement and has extensive training in LEAN and Six Sigma methods. He has served as a consultant and auditor for financial and administrative activities in primary health centers around the country during the last 15 years for the Bureau of Primary Health Care. He has been in health care management since 1985 through employment with West Texas health care facilities.

Mr. Sullivan has served on the TMF board since 2014.

Ronald S. Walters, MD, MBA, MHA

Photo of Ronald WaltersDr. Walters is associate vice president of Medical Operations and Informatics at The University of Texas MD Anderson Cancer Center in Houston. He is also professor of clinical medicine, Department of Breast Medical Oncology; medical director, for Managed Care Programs; and, medical director for the Case Management Program, at the cancer center. He earned his Doctorate of Medicine at the University of Nebraska College of Medicine. He is board certified in internal medicine and medical oncology. Dr. Walters is a delegate to the Texas Medical Association. He has coauthored more than 80 peer-reviewed original medical research articles.

Dr. Walters has served on the TMF board since 2016.