In 2013, Alexander Posell, MD graduated Phi Beta Kappa and summa cum laude from Occidental College with honors in psychology; he then went on to study medicine at the University of Southern California (Los Angeles, CA) and residency in general/adult psychiatry at SUNY Downstate. He is currently pursuing a fellowship in forensic psychiatry through New York University, and has conducted numerous forensic interviews with asylum applicants via Physicians for Human Rights.

At SUNY Downstate, Dr. Posell was a chief resident, co-wrote a book chapter on geriatric psychosis with Dr. Michael Reinhardt, and published on the psychiatric effects of hyperparathyroidism.

Dr. Posell has worked as a clinician at Kings County Hospital, Rikers Island, Coney Island Hospital, Lenox Hill, Kingsboro, the Brooklyn campus of Veterans Affairs, and several other locations around New York City.