He earned a medical degree from University of Puerto Rico in 2000 and completed his residency in radiation oncology at SUNY Upstate Medical University in 2005. Dr. Gay joined the Washington University faculty in 2009 from East Carolina University, The Brody School of Medicine. His clinical practice and academic interests include cancer of the genitourinary area (prostate, urologic, bladder and kidney) cancer and head and neck cancer. He serves as the Clinical Director of Radiation Oncology at Siteman Cancer Center-South County.