Physician Bios

Dr. Paul Sanders

Dr. SandersDr. Sanders opened his practice of Internal Medicine and joined the staff of Presbyterian Hospital of Dallas in 1977. He served as President of the Medical Staff in 1988-1989. He is Clinical Assistant Professor of Medicine at UT Southwestern Medical School in Dallas.

A native of Tyler, Texas, Dr. Sanders graduated from Lee High School. After receiving his Bachelor’s degree in biology from North Texas State University, he obtained his medical degree from the University of Texas Medical Branch in Galveston. He completed internship and residency training at the University of Texas Medical Branch Hospitals in 1976 and completed further studies in asthma and lung immunology at the Johns Hopkins Medical School in Baltimore, where he worked in clinic immunology. His practice is focused on prevention of heart disease and stroke, travel medicine and vaccine medicine.

Dr. Sanders is Board Certified in Internal Medicine, a Fellow of the American College of Physicians and a member of the Dallas County Medical Society, Texas Medical Association, Texas Club of Internists, and the International Society of Travel Medicine. He is a partner in the Medical Clinic of North Texas and member of Impel Management Company where he serves on the Board of Directors.


Dr. Mark A. Johnston

Dr. JohnstonDr. Johnston has been in private practice and on staff at Presbyterian Hospital since 1987.  Although born in San Antonio, he claims Dallas as his hometown, having attended Jesuit High School and W.T. White High School.  He received his Bachelor of Science Degree from Texas Tech University where he attended on a baseball scholarship.  He continues to be actively involved in sports.

Dr. Johnston received his Medical Degree from The University of Texas Southwestern Medical School in Dallas, and completed his residency in Internal Medicine at Good Samaritan and Veterans Hospitals in Phoenix.  He is a member of the American College of Physicians, American Medical Association, Texas Medical Association, International Society of Travel Medicine, and Dallas County Medical Society.  Dr. Johnston places strong emphasis on preventive medicine and wellness, with special interests in hypertension and cardiovascular disease.

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