2026-2027 Public Psychiatry Fellows
Marissa Justen, MD
Dr. Justen (she/her) is originally from Southern California and completed her undergraduate degree in physiology and neuroscience at UCSD. She then went on to complete her MD at Yale School of Medicine, where she developed an interest in the intersection of mental health, structural inequities, and access to care. While at Yale, she took a dedicated year to research disparities in treatment for opioid use disorder, with a particular interest in how structural racism influences access to medications such as buprenorphine and methadone. She is currently completing her final year of the UCSF psychiatry residency, where she is involved in research examining the mental health needs of justice-involved youth, with a focus on how systems-level factors influence access to care. Clinically, Dr. Justen is particularly interested in helping patients build meaningful, values-driven lives in the context of severe mental illness. Outside of medicine, she enjoys reading, staying active through weightlifting and taking walks, and trying new restaurants.
Zane Davis, MD
Dr. Zane Adam Davis was born and raised in Alaska, where he completed his undergraduate education at the University of Alaska Anchorage. He subsequently earned his MD from the University of Washington School of Medicine. His clinical and scholarly interests include community and public psychiatry, addiction treatment, care for justice-involved patients, and psychodynamic psychotherapy. In addition to his residency training, he has pursued formal training in psychoanalytic psychotherapy at the San Francisco Center for Psychoanalysis and currently participates in the American Psychoanalytic Association’s Teachers’ Academy, where he is developing a residency didactic curriculum surveying psychoanalytic theory in a public mental health context. He has also been involved in national leadership through the APA Foundation Public Psychiatry Fellowship and the APA Ethics Committee. Drawing on a longstanding commitment to harm reduction, underserved communities, and carceral mental health, he hopes to build a career that integrates psychoanalytically informed clinical thinking with systems-level leadership in public-sector psychiatry, helping to shape more humane, reflective, and effective models of care in community mental health settings.
Tosin Adebiyi Fancher, MD, MPH
Dr. Tosin Adebiyi Fancher is a multimodal artist and UCSF Child and Adolescent Psychiatry (CAP) Fellow whose mission is to champion healing for young people through clinical expertise, ancestral wisdom, and a deep belief in the power of imagination.
She grew up between New York City and Lagos, Nigeria, and carried that expansive worldview into the University of Iowa, where she earned dual bachelor's degrees in Human Physiology and Art/Art History. She completed her M.D. at the University of Colorado School of Medicine, where she founded the Stress Fest wellness initiative, co-founded the Upstander Intervention Training, and led projects at the Health Equity in Action Lab. Seeing the pandemic's disproportionate toll on the mental health of her community, she pursued a Master of Public Health at UC Berkeley with certificates in global health and multicultural health. She then went on to complete her adult psychiatry residency at UCSF, developing clinical expertise in coordinated specialty care for early psychosis and perinatal mental health.
Now, as a CAP Fellow in the public psychiatry track her interests include early psychosis care, supporting family systems through psychodynamic and drama therapy, and reducing global mental health stigma so that every young person can access care that sees them fully.
Jacqueline Leon, MD, MPH
Jacqueline Leon (she/ella) is from Fresno, California and received her BA in public health at UC Berkeley and Master of Public Health at UC Los Angeles (UCLA). She earned her medical degree from University of California, Davis. While she was in medical school, she was enrolled in the San Joaquin Valley (SJV) PRIME, a program committed to meeting the needs of underserved populations of central California. Prior to training to be a physician, her career was serving as a public health practitioner with extensive health leadership experience spearheading various health promotion, health care diversity workforce, quality improvement and clinical initiatives across various public healthcare settings. She also has a background in teaching undergraduate pre-medical courses and clinical skills and serving as a mentor and academic coach to underrepresented, first generation pre-health students. Dra. Leon has been recognized for her leadership and dedication to public service such as being awarded the National Medical Fellowship Health Equity Leaders Program, UC Davis Health International Women’s Day Award, Zuckerberg San Francisco General Krevans Award, and Central Valley Medical Association 2026 Resident of the Year award. Her interests include cultural psychiatry, child and adolescent psychiatry, reproductive psychiatry, medical education, health workforce development & diversity, health services research, and community engagement and advocacy. Dra. Leon is excited to join the public psychiatry fellowship where she will be working at Mission Mental Health serving Spanish-speaking and LGBT populations. Outside of medicine, Dra. Leon loves spending time with family, listening to music, watching horror movies, true-crime television, and sightseeing.