Dr. McNicholas is Assistant Professor of Medicine in the Division of Occupational and Environmental Medicine.  He completed medical school at the Lake Erie College of Osteopathic Medicine and residencies in Internal Medicine at the Naval Medical Center San Diego and in Occupational and Environmental Medicine at UCSF.  He is a US Navy Veteran who served as the sole Naval Flight Surgeon at Diego Garcia, British Indian Ocean Territory. Following training, Dr. McNicholas served as Staff Internist at the Naval Aerospace Medical Institute in Pensacola, FL where he was also a core faculty member of the Residency in Aerospace Medicine, receiving the Jay Phelan Faculty Instructor of the Year Award shortly before matriculating to UCSF. He received a National Institute of Occupational Safety and Health Targeted Research Training in Occupational Health grant in 2021 and was recently awarded the M. Donald Whorton Writing award by the Northern California Center for Occupational and Environmental Health at UC Berkeley.