Dr. Timothy McCajor "Cage" Hall, (he/him) is a psychiatrist, addiction physician, and psychological anthropologist, and an associate clinical professor in the Department of Family Medicine and the Department of Anthropology at the David Geffen School of Medicine at UCLA. He trained at Harvard, University of California San Diego, Charles University (Prague), University of Chicago, the New Center for Psychoanalysis (Los Angeles) and UCLA.

He has done ethnographic work on MSM sexual identities and communities in Czech Republic and Southern California, and worked on clinical trials of HIV prevention and of potential treatments for substance use disorders, particularly methamphetamine use disorder. He sees adult and geriatric patients in UCLA's HIV clinic. He is a behavioral science specialist on the LGBT Primary Care fellowship at UCLA, and teaches a course on gender & sexuality considerations in psychotherapy at the New Center for Psychoanalysis.