Dr. Lewis received comprehensive training at some of the largest county hospitals in the United States, including Parkland in Dallas and John Peter Smith in Fort Worth. Additionally, he trained at the second-largest VA hospital in the country and the sole academic tertiary referral hospital in a metropolitan area serving six million people (UT Southwestern). Dr. Lewis also completed training at Children's Medical Center in Dallas, a 600-bed pediatric-only trauma and tertiary referral center.