In addition to English, he speaks Spanish. He is professionally affiliated with Seton Medical Center Austin, Dell Children's Medical Center of Central Texas, and the University Medical Center Brackenridge. Dr. Williamson attended the University of California, Los Angeles (UCLA), David Geffen School of Medicine and then went on to complete his residency at a hospital affiliated with Baylor College of Medicine. He accepts Blue Cross Blue Shield Bronze, Blue Cross Blue Shield HMO, and Blue Cross Blue Shield Gold, as well as other insurance carriers.