Dr. Mary De May received her medical degree from the State University of New York at Stony Brook. She completed an internship in medicine and psychiatry at the University of Pennsylvania in Philadelphia and subsequently did her psychiatry residency and fellowship at the University of Pittsburgh Western Psychiatric Institute and Clinic. She joined the UCSF Memory and Aging Center in 2000, where she is the Center's Hellman Master Clinician.

As an attending physician at the Memory and Aging Center Clinic, Dr. De May participates in the multidisciplinary, comprehensive evaluation of new patients and research participants, as well as providing ongoing care. She teaches neurology residents and fellows, psychiatry interns, geriatric medicine fellows and other rotating clinicians. She also performs psychiatric evaluations for patients referred from within the Memory and Aging Center and helps them find appropriate psychiatric care within the community as needed.