Toby J. Dunn, M.D. was born in Houston, Texas. He went to the University of Texas, Austin for undergraduate studies and Duke University for his medical degree. He came to St. Louis and attended Washington University School of Medicine where he completed his residency and a Vascular Surgery Fellowship.
He is board certified in Vascular Surgery by the American Board of Colon and Rectal Surgery. He began private practice in in 2005 in Texas, and returned to St. Louis to begin practice at St. Luke's Hospital in Chesterfield, MO in October 2015.