Dr. Brian Im is the medical director for the NYU Rusk brain injury rehabilitation program and program director for the ACGME accredited brain injury medicine fellowship at NYU School of Medicine. He is heavily involved in program development and academic medicine. He has an active role in TBI research with a focus on studying health care disparities and differences that exist in traumatic brain injury care for different populations. In this interview, Dr. Im discusses some of the medical complexities associated with complex TBI. After completing medical school at SUNY, Syracuse, a rehabilitation residency at NYU School of Medicine/Rusk Rehabilitation, and a fellowship in brain injury medicine at UMDNJ/Johnson Rehabilitation Institute, his subsequent tenure at Bellevue Hospital focused upon an interest in improving brain injury rehabilitation for underserved populations. In Part 2, we discussed: becoming overweight as a risk following a TBI, whether a preexisting endocrine dysfunction can trigger a thyroid dysfunction, gait abnormalities that might stem from a TBI, the status of pharmacological treatment of a brain injury, and research on TBI being conducted at Rusk, along with any system enhancements either underway or being planned.