Dr. Lehman completed residency at UCSD. He was on faculty at UCSD from 2006 to 2025. During that period he worked at the La Jolla Veterans Affairs Hospital. Since 2025 he has joined the faculty at Uniformed Services University of the Health Sciences and is on staff at Navy Balboa Medical Center. Dr. Lehman is a Distinguished Fellow of the APA and has won numerous teaching awards. He has been twice named as San Diego Magazines Top Doctors in Psychiatry. He is also a member of the American Society for Clinical Hypnosis.