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Program Leadership

Darcy Wooten, MD, MS 

​Fellowship Program Director 
Darcy Wooten, MD, Mattended undergrad at Stanford University where she studied Human Biology. She completed medical school and IM residency at the University of California, San Francisco and earned a Masters in Health and Medicine Sciences from UC Berkeley.  She completed her ID fellowship training at Harbor UCLA before starting as faculty at UCSD in 2014.  Her areas of clinical interest include HIV Medicine and General Infectious Diseases.  Her passion is medical education.  She directs the Clinical Foundations course for first and second-year medical students and is highly involved in teaching, mentoring, and curricular development for clinical medical students and IM residents.  She served as the Associate Program Director for the ID Fellowship Program before moving into the Program Director role.  She is an active member of the IDSA's Community of Practice for Medical Education.  She enjoys spending time with her motorcycle-riding, bourbon-distilling husband, Joe, her energetic and independent toddler, Maya, and her loveable Aussie-Doodle, Bourbon. 

Nancy Law, DO, MPH 
Associate Fellowship Program Director 
Nancy Law, DO, MPH obtained her undergraduate degree from Pennsylvania State University where she studied Life Sciences and minored in Microbiology, Chinese, and Women’s Studies.  Dr. Law then went on to pursue a dual degree getting her MPH with a concentration in Health Planning and Geriatric Health and her DO degree in June 2011 from A.T. Still University School of Osteopathic Medicine in Arizona.  Dr. Law completed two fellowships, the first in Infectious Diseases in her hometown of Philadelphia at Drexel University College of Medicine, and the second fellowship in Transplant Infectious Diseases at University of Toronto/University Health Network.  She started as faculty at UCSD in 2017. Her areas of clinical interests include Solid Organ Transplant and Oncology Infectious Diseases as well as Antimicrobial Stewardship in immunocompromised hosts.  Her other passions include medical education and building diversity and cultural competency in all areas of medicine. Dr. Law is currently serving as the he Associate Program Director for the ID Fellowship Program as well as the Assistant Director of Epidemiology & ASP, for the Immunocompromised Services.   She is an active member of the International Society for Heart and Lung Transplantation and the American Society of Transplant Infectious Disease Community of Practice.  Dr. Law spends her free time traveling to a new country every year,  updating her foodie list, or planning the next romantic date or adventure for her husband, Ross, and sassy daughter, Sofia. 

Mary Lewinski, MD, PhD

​Associate Fellowship Program Director
Mary Lewinski, MD, PhD, earned undergraduate degrees in Philosophy and Political Science with a Minor in Russian Language and Literature from the University of Southern California. She pursued her MD and PhD in Biomedical Sciences at UC San Diego as part of the Medical Scientist Training Program. Her graduate research on "Retroviral Integration: Mechanism and Consequences" was conducted in the laboratory of Rick Bushman, PhD, then at the Salk Institute for Biological Studies. She completed her research-track Internal Medicine residency as part of UC San Diego's Physician Scientist Training Pathway before matriculating into UC San Diego's Infectious Diseases Fellowship. Her T32-funded fellowship research in the laboratory of John Guatelli, MD, focused on HIV-host interactions and led to an NIH K08 award, "HIV-1 Modulation of the Ubiquitinome and Its Effects on Cell-to-Cell Transmission." Since starting her faculty position at UC San Diego in 2014, she has continued her involvement with the MSTP and PSTP and currently serves as an Associate Program Director for the ID Fellowship Program. Her research interests include viral-host interactions with active projects investigating HIV and SARS-CoV-2. She also serves as the Developmental Core Director for the San Diego Center for AIDS Research. Her clinical work is primarily at the VA San Diego Healthcare System and focuses on HIV Primary Care and General ID. Dr. Lewinski spends her free time homebrewing (having completed UC San Diego's Brewing Professional Certificate Program), playing with her Maltipoo, Nikita, and visiting national parks with her husband, Jeff.

2022-2023 Incoming Infectious Disease Fellows

​Morgan Birabaharan, MD
1st Year Fellow
Morgan Birabaharan, MD, graduated from Lehigh University and worked a year as a NIH Postbac IRTA Fellow, before receiving his MD from Hofstra Northwell. After medical school, Morgan joined the ABIM research pathway at UC San Diego, where he has felt incredibly privileged to collaborate with and be personally mentored from world-renowned faculty. Currently, his research interests are broad and include the extrapulmonary manifestations of SARS-CoV-2, sex differences in HIV aging, as well the interplay between the gut microbiome and development of chronic disease. During his medical career he has been awarded the IDSA Medical Scholar, IDSA Kass Award, and has had the kind opportunity to be an expert referee for major medical journals including Clinical Infectious Diseases, Open Forum Infectious Diseases, and the Annals of Internal Medicine. During fellowship, Morgan is eager to continue to use his mentorship and resources at UC San Diego to further refine his research interests and obtain the tools necessary to lead his own basic-science lab, pursuing discovery and new knowledge in the field of infectious diseases.

​Elizabeth Hastie, MD
1st Year Fellow
Elizabeth (Lizzy) Hastie, MD, grew up in Cincinnati, Ohio and studied physics during undergrad at the University of Colorado Boulder. She then moved to Atlanta where she attended medical school at Emory University. She completed internal medicine residency at UCSD and stayed for an additional year as a Chief Medical Resident. During residency she pursued research in HIV and CMV. Dr. Hastie is thrilled to be joining the UCSD ID department and is interesting in pursuing a career in HIV medicine. She is also passionate about medical education and hopes to remain in an academic setting.

Hansang Park, MD, MPH
1st Year Fellow

Hansang Park, MD, MPH, Was born and raised in South Korea, where he attended college and medical school. After one year of post-graduate internship training, he worked as a PCP for three years before moving to the US. He is currently completing an internal medicine residency at NYMC and MPH degree at UC Berkeley. He has previous experience with MERS and COVID, and his passion is scientific research focusing on emerging viral infections, antiviral development, both from translational and clinical perspectives. After the fellowship, he hopes to continue his career as a physician-scientist in academic medicine.

2021-2022 Infectious Disease Fellows

Benjamin Chen, MD, MPH
1st Year Fellow

Benjamin Chen, MD, MPH, grew up in the San Francisco Bay Area where he attended college and graduate school. After graduation, Dr. Chen moved to New Orleans for medical school at Tulane University School of Medicine. He is currently completing residency at University of Iowa and is looking forward to continuing his training at UC San Diego in July 2021. Dr. Chen's career interests are in global health and medical education, for which he has participated in research abroad and also piloted novel teaching tools. Dr. Chen's professional goal is to remain in academic ID as a clinician educator. 

Michael Doud, MD, PhD
1st Year Fellow 
Michael Doud, MD, PhD, grew up in the Chicago suburbs before studying chemical engineering at the University of Michigan. He then spent two years as a research technician at Harvard Medical School, working in Dr. Timothy Springer's lab to determine the protein structure of a malaria vaccine target antigen. Dr. Doud moved to Seattle and completed combined MD/PhD training at the University of Washington, where he developed genomics technologies to study influenza virus evolution in Dr. Jesse Bloom's lab. He is currently completing internal medicine residency at UC San Diego. He has broad interests in basic science and infectious disease, including specific interests in bacteriophage biology and engineering therapeutic phages to treat antibiotic resistant infections.

Samantha Kaplan, MD

1st Year Fellow  
Samantha Kaplan, MD, attended medical school at Yale School of Medicine in New Haven, CT. During medical school, she spent a year as an NIH Fogarty Global Health Fellow in Cape Town, South Africa, conducting research on the risk factors and outcomes of HIV patients who disengaged from antiretroviral therapy in Khayelitsha, South Africa. After medical school, she completed internal medicine residency at the University of Washington as a Global Health Pathway resident. For several months, she worked in western Kenya on a study comparing the response to latent tuberculosis diagnostics between HIV-infected and uninfected pregnant women. She then worked as a hospitalist in Seattle before coming to UCSD for ID fellowship. During ID fellowship, Dr. Kaplan hopes to pursue her interests in HIV/TB epidemiology and global public health, while exploring emerging infections and tropical and border medicine. Dr. Kaplan hopes to pursue formal epidemiology training during fellowship, with a subsequent career in academic infectious disease global public health research and/or programmatic development at the national or international level.

Brady Page, MD, MPH
1st Year Fellow 
Brady Page, MD, MPH, graduated from UC Berkeley before receiving his MD and MPH&TM from Tulane University, where he was a Ben Kean Fellow in Papua New Guinea, a Fulbright-Fogarty Fellow in Brazil, and a CDC Fellow in Atlanta. He later completed his residency in Internal Medicine at Massachusetts General Hospital, where he continued to work on several projects in Papua New Guinea. Throughout his career, Dr. Page's clinical focus has been on addressing the infections and complications that disproportionately affect those living in communities that are underaccessed and underresourced. He is specifically interested in the epidemiology of outbreak-prone, resistant, or severe infections and the clinical management of patients who become critically ill from these infections in austere settings. Additionally, Dr. Page hopes to build on his relationships with clinical and research groups overseas to establish healthy, empowering, professional relationships between institutions in the US and abroad.

Francisco Guerra, MD, PhD
2nd Year Fellow
​Bio Pending...

Patricia (Katie) Riggs, DO
2nd Year Fellow
Patricia (Katie) Riggs, DO, completed her undergraduate degree at University of California, San Diego in biology. She then joined US Peace Corps where she served as a community health educator for two years in Tala, Eastern Province, Kenya with a focus on HIV/AIDS. She returned to San Diego and worked as research assistant and clinical trial coordinator at UCSD’s HIV Neurobehavioral Research Center which solidified her goal to become a physician to allow her to be a future research investigator and provide individual patient care. She went on to medical school at Kansas City University of Medicine and Biosciences, College of Osteopathic Medicine.  After graduation, she completed residency in internal medicine at Scripps Mercy Hospital in San Diego, California.  Dr. Riggs returned to University of California, San Diego in 2020 to pursue training in ID Fellowship. In addition to the clinical training, she is pursuing research focused on the neuropsychiatric effects of viral infections and associated immune dysregulation.

Rachel Sigler, DO, MPH
2nd Year Fellow
Rachel Sigler, DO, MPH, completed undergraduate and received an MPH at George Washington University in Washington DC. She then attended medical school at A.T. Still University of Health Sciences Kirksville College of Osteopathic Medicine. After medical school, Dr. Sigler completed residency in internal medicine at University of Kansas Medical Center. During ID fellowship, Dr. Sigler has pursued her interests in Transplant ID and medical education. Dr. Sigler hopes to complete the fellowship in the clinician educator track and pursue additional training in transplant ID with a subsequent career in Transplant Infectious Disease.

Rehan Syed, MD, MSc
2nd Year Fellow
Rehan Syed, MD, MSc, completed his undergraduate degree at Stanford University in human biology. In 2011, Dr. Syed received his MSc in public health at London School of Hygiene & Tropical Medicine in the UK. Dr. Syed returned to California in 2013 and completed both medical school, and residency in internal medicine, at the University of California, San Diego, where he subsequently pursued ID Fellowship in July 2020. During ID Fellowship, Dr. Syed has pursued research on COVID-19 and Guillan-Barre syndrome and preliminary reviews of biomarkers for progression in tuberculosis, in addition to his clinical work. After fellowship, Dr. Syed hopes to pursue research on the molecular epidemiology of the progression of disease in tuberculosis on with a subsequent career in academic medicine.

Jocelyn Keehner, MD
3rd Year Fellow

Jocelyn Keehner, MD professional interests include infection prevention and hospital epidemiology. Her research has focused primarily on occurrence of COVID infections in healthcare workers (HCW) and observing the impact of face masking, adequate PPE and vaccines on that population. Dr. Keehner is also involved in antibiotic stewardship through a QI project, in concert with the internal medicine and allergy departments, on improving beta lactam allergy assessment. She is also working on a project to assess the impact of Cannabidiol on improving post-covid anxiety and cognitive impairment.

​Claudia Ramirez-Sanchez, MD
3rd Year Fellow
Claudia Ramirez-Sanchez, MD is an Infectious Diseases Fellow at the University of California, San Diego completing her research years focused on Transplant Infectious Diseases. Originally from Santiago, Chile, she is a graduate from University of Illinois at Chicago College of Medicine, fulfilled her Internal Medicine Residency at John H. Stroger Hospitals of Cook County and Rush University Medical Center Primary Care Residency, and has been an Infectious Diseases fellow at UC San Diego since 2019.

Dr. Ramirez-Sanchez has a passion for Transplant Infectious Diseases and multidrug resistant infections, currently studying the role of bacteriophages in increasingly difficult to treat infectious processes. She’s also studying the effect of fungal infections in lung and heart transplantation as well as Hepatitis C virus infection in transplant recipients from viremic donors.

In addition to infectious disease topics, Dr. Ramirez-Sanchez is interested in understanding disparities, inequities and implicit bias in our health care system.

Sydney Ramirez, MD, PhD
3rd Year Fellow

Sydney Ramirez, MD, PhD, graduated summa cum laude from California State University, Sacramento with a B.S. in Biological Sciences. She subsequently graduated from the University of Texas Medical Branch at Galveston combined MD/PhD program in 2017, where she conducted her graduate research in molecular virology in the laboratory of Shinji Makino, DVM, PhD, with an emphasis on coronaviruses and other RNA viruses. In summer 2017, she moved back to California to begin Internal Medicine residency at the University of California, San Diego as part of the Physician-Scientist Training Pathway (PSTP). Following completion of the residency portion of the PSTP, Dr. Ramirez began her fellowship training with the UCSD ID Fellowship in July 2019. 

During fellowship, Dr. Ramirez joined the laboratory of Shane Crotty, PhD, at the La Jolla Institute for Immunology. Her postdoctoral research is focused on adaptive immunity to COVID-19/SARS-CoV-2.  After fellowship, Dr. Ramirez hopes to continue a career in biomedical research and clinical ID practice, bridging the gap between the bench and the bedside, and forwarding our understanding of the interactions between viral pathogens and host immune responses in the context of viral infections and vaccination

Elliott Welford, MD

3rd Year Fellow 

Elliott Welford, MD, completed undergraduate at Mississippi State University in Microbiology, and subsequently graduated from medical school in 2015 from the University of Mississippi.  Later that year, he moved to Ohio to complete residency in internal medicine at the University of Cincinnati.  Dr. Welford decided to go west to San Diego in 2019, and began training in ID Fellowship at the University of California, San Diego.  During fellowship, Dr. Welford has pursued research focusing on the overlapping epidemics of bacterial sexually transmitted infections and HIV.  His particular area of focus is on dynamic infectious disease modelling and economic modelling to evaluate the public health and economic impact of these infections.   After fellowship, Dr. Welford hopes to continue being a productive researcher in infectious disease and economic modelling by applying for a K award with a subsequent career in academic medicine.  

Samuel Penziner, MD
4th Year Fellow

Sam Penziner, MD obtained a B.A. in English literature from Yale University and an M.D. from NYU Medical School. He completed a residency in internal medicine at Vanderbilt before moving to UCSD for his fellowship in infectious diseases. He is interested in antibiotic resistance, virology, and phage therapy, and he currently conducts basic and translational research in the IPATH lab under Drs. David Pride and Robert "Chip" Schooley while collaborating with Dr. Nicole Steinmetz's lab in the department of nanoengineering. As a physician-researcher, he hopes to find ways to eventually develop phage therapy as a feasible alternative to antibiotics in the management of drug-resistant infections. 

Michael Tang, MD
4th Year Fellow

Michael Tang, MD, completed his undergraduate degree at the Ohio State University in Biochemistry. He completed medical school and Internal Medicine Residency at Washington University School of Medicine/Barnes Jewish Hospital before coming to UC San Diego for his Infectious Diseases Fellowship training. His research focuses on HIV epidemiology, methods for estimating incidence and the impact of HIV status on COVID-19 outcomes. In his free time, he enjoys traveling, hiking, exploring the beaches of San Diego and spending time with his wife and daughter.


After completing fellowship, our fellows have pursued both academic, private and community-based infectious diseases positions around the country and locally. Our fellowship has a strong track record of fellows obtaining academic faculty positions at UC San Diego.  Below are the past 6 years of graduating fellows and their current positions.

Thomas Martin, MD: Infectious Diseases Physician, UC San Diego Health, San Diego, CA 
Andrea Ramsey, MD: Staff Physician, Tuberculosis and Refugee Health Program, San Diego Department of Public Health & Infectious Diseases Specialist, Scripps Mercy, San Diego, CA
Thaidra Gaufin, MD, PhD: Infectious Diseases Physician, Sansum Clinic, Santa Barbara, CA
Stephen Rawlings, MD, PhD: Postdoctoral Fellow, UC San Diego Health, San Diego, CA 

Katya Prakash, MD: Assistant Professor, University of Maryland Medical Center, Baltimore, MD
Katherine Promer, MD: Infectious Diseases Physician, UC San Diego Health and Palomar Health, San Diego, CA
Minji Kang, MD: Assistant Professor, UT Southwestern, Dallas, TX

Sarah Burgdorf, MD, PhD: Assistant Professor, University of Pittsburgh Medical Center, Pittsburgh, PA
Lucy Horton, MD, MPH: Site Director, Asylum-Seekers Shelter Health Assessment Program, UC San Diego, La Jolla, CA
Stephanie LaVergne, MD: Assistant Professor, University of Colorado, Denver, Denver, CO
Melanie McCauley, MD: Research Physician, Emerging Infectious Diseases Branch, Walter Reed Army Institute of Research, Silver Spring, MD

Kevan Akrami, MD: Assistant Physician, UC San Diego, La Jolla, CA

Anne Cowell, MD:  Assistant Professor, UC San Diego, La Jolla, CA
Jennifer Dan, MD, PhD:  Assistant Professor, UC San Diego, La Jolla, CA
Susannah Graves, MD: Director, Tuberculosis Prevention and Control, City and County of San Francisco, Department of Public Health, San Francisco, CA
Helen King, MD: Assistant Professor, UT Southwestern, Dallas, TX

Monika Kumaraswamy, MD:  Assistant Professor, UC San Diego, La Jolla, CA
Samuel Pan, MD: Infectious Disease Specialist, Alliance Medical Group – Waterbury Health, Waterbury, CT
Nella Green, MD: Infectious Disease Specialist, Palomar Health, Poway, CA
Jeffrey Jenks, MD: Associate Physician, UC San Diego, La Jolla, CA
Shawn Koura, MD: Infectious Disease Specialist, Sharp Medical Center, Chula Vista, CA