Our Addiction Medicine Fellows

Brittany Denzer, MD (she/her) grew up in a small coffee town on the Big Island of Hawaiʻi, a place that deeply shaped who she is through its diverse community, rich culture, and connection to nature. She moved to Colorado to attend Colorado College, where she studied Ecology and Music. After graduating, she spent several years back in Hawaiʻi doing conservation biology (including working on a seahorse farm!) before deciding to pursue medicine, motivated by a desire to address health inequity and the physician shortage in rural Hawaiʻi. Medical training brought her back to Colorado, where she completed medical school, Internal Medicine–Primary Care residency, and most recently a Chief Resident year. Her training experiences, especially her work at Denver Health, Denver’s safety-net hospital, deepened her love for underserved care and addiction medicine. Other clinical interests of hers include women’s health and climate change and health. She is so excited for this next chapter of fellowship and the opportunity to deepen her training in addiction medicine as she works toward her dream of increasing access to high-quality primary and addiction care in her home community. Outside of medicine, you’ll find her hiking or mountain biking, sewing upcycled thrift projects, tending to her plants, playing piano, or spoiling her dog, Zumi. She is really looking forward to life in San Francisco — being close to her brother who lives in the Mission, living near the ocean, feeling a little closer to home, and learning in such an incredible community.

Joanna Krupp, MD (she/her) is originally from Boston and spent most of her life in the northeast before moving to North Carolina for medical school at Duke and the UCSF Primary Care Internal Medicine Residency at San Francisco General. With an educational background in public health, she has always been interested in working in primary care in the safety net. She became interested in addiction medicine after working as a case manager for unhoused individuals using drugs. In medical training, she has continued to be interested in the intersection of primary care and addiction medicine, grounded in a commitment to harm reduction and low-barrier care. Outside of work, she can be found reading in a park with copious amounts of sunscreen, searching for her future dog on animal shelter websites, sampling street tacos throughout the Mission, and running/biking/hiking and eating her way around the Bay. 

Carlos Razo, MD (he/him) was raised in Boyle Heights, Los Angeles. He comes from a single-mother household and is proud to say that he is a first-generation Mexican American and the first in his family to become a doctor. From a young age, he knew he wanted to pursue medicine. As he grew older, he recognized the need for providers who can deliver culturally competent care. His experiences in higher education further solidified his desire to become a Spanish-speaking physician who can effectively communicate with patients and advocate for their needs. Carlos attended Occidental College, where he majored in Biochemistry and minored in Mathematics. Although he entered medical school at St. Louis University in Missouri intending to pursue Pediatrics, he ultimately found fulfillment in the comprehensive and longitudinal care that Family Medicine provides. He was blessed to match at his top-choice for residency, Scripps Chula Vista Family Medicine Residency. His time there has further strengthened his commitment to advocating for patients and their health. Carlos is excited to continue growing at UCSF and learning how best to support under-resourced communities while providing high-quality, evidence-based medical care.

Anna Smith, MD (she/her) grew up in the cornfields of the Midwest. After college, she served in a volunteer program working with adults living with mental illness and unstable housing. She then worked at the Downtown Emergency Services Center (DESC) in Seattle as a mental health case manager. These experiences led her to medicine as a way to combine her interests in health equity, advocacy, service, and patient care. She completed a dual residency in Psychiatry and Family Medicine at Boston Medical Center and is a Massachusetts Institute for Psychoanalysis two-year fellow. She is excited to pursue Addiction Medicine Fellowship to further provide holistic care to underserved communities. After residency, she will be working with the National Health Service Corps. In her spare time, she enjoys laughing with her husband and napping with her cat.

Hannah Tierney, MD MPH (she/her) grew up in the North Bay and attended UC Santa Cruz for undergrad, where she studied the biological foundations of the brain and behavior. After graduating, she developed an interest in alcohol and substance use disorders and spent several years working in clinical, research, and public health settings addressing issues related to substance use, HIV, and HCV. These experiences inspired her to pursue medical and public health training through the UCSF/UC Berkeley combined MD/MPH program. Hannah is currently completing her internal medicine residency at UCSF through the San Francisco General Primary Care track and is excited to continue her training at San Francisco General Hospital in the Addiction Medicine Fellowship. Her academic interests are centered at the intersection of addiction, HIV medicine, STI prevention, and women’s health. In her free time, Hannah can be found hiking the hills of the Bay Area, enjoying locally grown foods, and obsessing over her pet bunnies, Merlin and Mabel.

Frances Enger, MD MPH 

Meghan “Murph” Murphy, MD, MPH 

Andrew Pastor, MD 

Noemi Plaza, MD 

 Leni Popova, MD

Stephanie Clavijo, MD MPH

Mike Levy, MD

Chance Najera, MD

 Asmi Panigrahi, MD MPH

Sarah Rosenwohl-Mack, MD

Sarah Burbank, MD

Jonny Callan, MD

Alejandro Castellanos, MD

Dymon Morgan, MD

Simone Vais, MD

Sam Lee, MD

Amy Liang, MD

Stephen Matzat, MD

Ekene Ojukwu, MD, MSc

Nicole Tantoco, MD, MPH

Meredith Adamo, MD

Theora Cimino, MD

 Michelle Lough, MD, MPH

Surabhi Nirkhe, MD

Gigi Simmons, MD

Elizabeth Abbs, MD

Ayesha Appa, MD

Katrina Ciraldo, MD​​​​

Trevor Lee, MD

Sarah Leyde, MD

Nicky Mehtani, MD MPH

Jesse Ristau, MD

Triveni Defries, MD MPH

Christy Soran, MD MPH

Jamie Carter, MD MPH

Hannah Snyder, MD