Richard Zuckerman, MD, MPH, has been the Program Director of the Infectious Disease (ID) Fellowship since 2010. He is also the Interim co-Chief of the IDIH Section. His main clinical focus is in the care of Transplant and Immunocompromised Hosts and he is currently the Director of that service. When not seeing patients, he is very active in medical education. He serves as the Course Director for the Geisel School of Medicine first-year course Infection, Inflammation and Immunity (I3) and is mentor to trainees at all levels. He has various research and other academic projects within ID, transplant and immunology and serves on the steering committee for the Dartmouth International Vaccine Initiative (DIVI). Dr. Zuckerman is also involved in leading and supporting efforts to improve equity among physicians and patients, and is a faculty advisor for the JEDI (Justice, Equity, Diversity Inclusion) Program, among other efforts. His greatest joy is in helping others find their passion in medicine and ID by providing opportunity and guidance. When not working, he can be found sitting on a bike, standing on skis or enjoying his family.
Colleen Kershaw, MD received her MD from Georgetown University School of Medicine, and went on to complete Internal Medicine residency as well as Infectious Disease fellowship at Beth Israel Deaconess Medical Center in Boston, where her academic focus centered on medical education. She also completed a fellowship in Global Health through the Botswana-Harvard Partnership. Her clinical interests are broad in general infectious disease but in particular include HIV as well as care of underserved and marginalized populations, with an interest in the intersection of infectious disease and addiction. Her recent quality improvement and academic work has surrounded supporting patients and clinicians to make patient-centered decisions about care for people who inject drugs.
She serves as the Medical Director for the Outpatient Parenteral Antimicrobial (OPAT) Program, as well as Associate Program Director for the fellowship. Colleen is also a Certified Physician Professional Development Coach. She is excited to work with fellows to consider their values and passions in developing a career, as well as helping them navigate the incredible resources and expertise in various areas offered through fellowship at Dartmouth Hitchcock Medical Center to tailor to their needs, plans and growth.
Antonia Altomare, DO, MPH is an Infectious Disease physician at Dartmouth Health, and Associate Professor of Medicine at the Geisel School of Medicine at Dartmouth. Dr. Altomare is the Co-Program Director for the Ryan White HIV Program at Dartmouth, for which she is responsible for ensuring the delivery of high-quality care to more than 900 people living with HIV. She is also the Primary Investigator for the New Hampshire AIDS Education and Training Center Program, providing expert education to healthcare teams across New Hampshire and Vermont on HIV and HIV-related topics. Dr Altomare is also the Associate Program Director for the Leadership Preventive Medicine Residency at Dartmouth and Co-Course Director for the Introduction to Quality Improvement course for the MPH program at The Dartmouth Institute for Health Policy and Clinical Practice. Her primary interests are in leadership, quality improvement, and education. She manages patients with general infectious diseases, with an interest in HIV medicine and sexually transmitted infections. She is excited to precept fellows and impart her professional and life wisdom to our new fellows.
Gabriela Andujar Vazquez, MD completed her undergraduate education at the University of Puerto Rico, where she received a BS in Biology. She completed medical school at the Universidad Central del Caribe in Puerto Rico. Afterwards, she did her Internal Medicine Residency at Mount Sinai Beth Israel Medical Center in Manhattan, New York followed by Infectious Diseases Fellowship at Tufts Medical Center in Boston, Massachusetts. She completed a clinical research certificate at the Clinical and Translational Science Institute at the Tufts University Sackler School of Biomedical Sciences.
Dr. Andujar was one of the first awardees of the Leadership in Epidemiology, Antimicrobial Stewardship, and Public Health (LEAP) Fellowship. This is a national training award competitively granted to 4 promising young Infectious Diseases physicians a year funded by the Centers for Disease Control and Prevention. Subsequently, she became faculty at Division of Geographic Medicine and Infectious Diseases at Tufts Medical Center. During her time at Tufts Medicine she served as the Associate Hospital Epidemiologist and Director of the Antimicrobial Stewardship Program.
Afterward, in 2025, she joined as faculty to the Infectious Diseases and International Health Section at Dartmouth Health. She serves as the Healthcare Epidemiologist for Dartmouth Hitchcock Medical Center and Clinics and leads the Infection Prevention ID fellowship concentration at Dartmouth.
Dr. Andujar is highly committed to advancing the fields of Infection Prevention (IP) and Control, Hospital Epidemiology, Antimicrobial Stewardship (AS), and Antimicrobial Resistance. She is most excited on working and mentoring ID fellows interested in Infection Prevention and Antimicrobial Stewardship.
Michael Calderwood, MD, MPH is the Chief Quality Officer of Dartmouth Hitchcock Medical Center. His responsibilities include oversight and management of safety, quality, care experience, regulatory compliance, and process improvement activities for the hospital and clinics. In addition to his leadership driving positive change in our culture of safety and quality improvement activities, Dr. Calderwood remains clinically active and engaged in medical education as an infectious diseases physician and Associate Professor of Medicine at the Geisel School of Medicine. Through his work with the Institute for Healthcare Improvement, the Infectious Diseases Society of America, and the Society for Healthcare Epidemiology of America, Dr. Calderwood has been a leader in health policy, quality measurement and reporting, disease prevention, leadership development, and quality improvement methodologies focused on leading and sustaining change. He has held previous leadership roles managing antimicrobial stewardship and hospital epidemiology, and he continues to work closely with these teams as they seek to ensure the best care for our patients and our communities. Clinically, Dr. Calderwood has specific expertise in the prevention and management of surgical infections, including complex device-associated infections. He is excited to train fellows to become experts in collaborative management of infectious diseases and the role of infectious diseases physicians as agents of change and healthcare leaders.
David de Gijsel, MD, MSc, MPH is interested in the syndemic of substance use and infectious diseases. As an infectious disease physician at Dartmouth Health, he focuses on new care models for the treatment of hepatitis C in people who inject drugs. As the Chief Health Officer at Better Life Partners, he designs and implements virtual and community-embedded, whole-person care for people with substance use disorders in Vermont, New Hampshire, Maine, Massachusetts and North Carolina.
David hails from the Netherlands, where he completed medical school at the University of Amsterdam. He completed his residency in Internal Medicine and Primary Care at Montefiore Medical Center/Albert Einstein College of Medicine in the Bronx, New York. He stayed at Montefiore as an internist for several years before spending 2 years in Kigali, Rwanda, with the Human Resources for Health Program. Upon his return to the US, he came to Dartmouth Hitchcock Medical Center for a fellowship in Infectious Disease and a residency in Leadership Preventive Medicine.
David holds appointments as Assistant Professor at the Geisel School of Medicine and at The Dartmouth Institute for Health Policy and Clinical Practice. He is board certified in Internal Medicine, Infectious Diseases and in Addiction Medicine. As of June, 2025, he is the president-elect of the Northern New England Society of Addiction Medicine and a board member of the HIV/HCV Resource Center in Lebanon, New Hampshire, an AIDS service organization and syringe service program.
He lives in Norwich, Vermont, with his wife, daughter and dog.
Bryan Marsh, MD received his MD from the University of Chicago, and then completed his training with residency and fellowship at Dartmouth Hitchcock Medical Center. He joined the faculty of the Section of IDIH in 1996 and is now an Associate Professor of Medicine. Dr. Marsh's main interest is in the care of people living with HIV/AIDS, but his clinical activities also include consultation in general infectious diseases as well as on the transplant consultation service. He is the Medical Director of the HIV Program and the Ryan White Part C Program, and the Director of the Comprehensive Antimicrobial Program.
Anais Ovalle, MD, MPH is an infectious diseases physician with a growing clinical interest in mycobacterial and orthopedic infections. She earned her medical degree from Universidad Iberoamericana in 2014, completed her internal medicine residency at Memorial Hospital of Rhode Island in 2018, and served as Chief Resident at Kent Hospital the following year. She completed her infectious diseases fellowship at Dartmouth Hitchcock Medical Center in 2022 and has since returned to Dartmouth Hitchcock Medical Center as faculty.
Dr. Ovalle is deeply committed to advancing health equity through clinical innovation and medical education. She co-leads the Health Equity Curriculum at the Geisel School of Medicine, developing educational strategies that promote structural competency and inclusive care. Her academic interests focus on reimagining healthcare delivery to improve access, particularly for rural and marginalized communities.
As a clinician-educator, Dr. Ovalle is passionate about mentoring the next generation of infectious diseases specialists. She is particularly excited to work with fellows to tailor their training experiences based on their interests and goals, encouraging a learner-centered approach that fosters both clinical excellence and professional growth. She aims to cultivate a supportive learning environment grounded in curiosity, empathy, and a commitment to health justice.
Jeffrey Parsonnet, MD received an AB degree from Princeton University in 1975 and an MD degree from New York University School of Medicine in 1979. He then completed a residency in Internal Medicine at Yale-New Haven Hospital and a fellowship in Infectious Diseases in the combined Brigham and Women’s/Beth Israel Hospital program. After serving on the Harvard Medical School faculty from 1985-1990, he joined the faculty of Dartmouth Medical School in 1990, where he is Professor of Medicine. Dr. Parsonnet’s main research interest has been staphylococcal toxic shock syndrome, but his clinical interests through the years have included HIV infection, Lyme disease, staphylococcal infections, orthopedic infections, and septic shock. In 2020 he became interested in a new entity, “post-acute COVID syndrome” (PACS)” or “Long COVID,” and he started the Dartmouth Hitchcock Medical Center PACS Clinic. The Clinic offers a multidisciplinary approach to this complex, evolving syndrome and has received thousands of referrals since its inception. We are also involved in several interventional studies for Long COVID. Dr. Parsonnet would enjoy working with fellows in any of these areas of clinical interest.
Elizabeth Talbot, MD is an infectious diseases- and tropical medicine-trained internist, who has had extensive experience in international and domestic infectious disease control through outbreak investigation, clinical projects, research, and consultation. She trained in internal medicine, infectious diseases and global health at Duke University. She then served in the Epidemic Intelligence Service during which she was stationed in Botswana with the CDC. She was seconded to the World Health Organization in Geneva before coming to Dartmouth. At Dartmouth, she is a Professor of Medicine in the Section of Infectious Diseases and International Health at the Geisel Medical School at Dartmouth, and has serviced as co-interim Section Chief since 2024. Since 2003, Dr. Talbot has been New Hampshire’s Deputy State Epidemiologist, where she is engaged in leadership for outbreak and pandemic response, including policy/guideline development, clinician education, outbreak response, and medical countermeasure allocation. Her primary interests are mycobacterial diseases, including directing the NTM Clinic at DH, as TB Medical Advisor for NH DHS, and global TB research. She has active projects in Namibia, Rwanda, Indonesia, South Africa and Tanzania. Since January 2020 she has been a consultant to Gates MRI toward identification of TB treatment monitoring biomarkers. Dr. Talbot welcomes fellows to participate in outbreak investigations for NH DHHS, NTM treatment research, studies of cough monitoring as a biomarker to predict cure, and multiple global TB relevant projects including in pediatric TB and development of long acting injectable TB medications.
Harmony Tyner, MD, MPH received her MD from the University of Minnesota and completed her residency and fellowship through the clinician investigator training program at the Mayo Clinic in Rochester, MN. She also holds a master’s of public health in hospital molecular epidemiology from the University of Michigan School of Public Health. She is interested in clinical care and the pursuit of clinical excellence and patient advocacy. She is interested in how clinical interactions impact patient outcomes, and the role of engagement and ownership in patient care. She has a particular interest in marginalized patients and marginalized conditions, and specifically in neglected tropical diseases. She holds an appointment as Assistant Professor at the Geisel School of Medicine. She is looking forward to sharing the joy of clinical medicine with fellows and creating an environment that favors curiosity and growth.
Rebecca Wang, MD is an Infectious Disease physician at Dartmouth Hitchcock Medical Center and Assistant Professor of Medicine at Geisel School of Medicine at Dartmouth. She received her MD from Geisel School of Medicine at Dartmouth. She went on to complete her Internal Medicine residency and Infectious Diseases fellowship at the Hospital of the University of Pennsylvania, where her academic focuses centered on Transplant Infectious Diseases and Antimicrobial Stewardship. She joined as faculty at Dartmouth Hitchcock Medical Center in 2021. Her clinical interests are broad but in particular include the care of immunocompromised hosts, including individuals with hematologic malignancies, stem cell transplants, and solid organ transplants. She has training and interest in antimicrobial stewardship as well as quality improvement, and she currently serves as the Co-Director of the Antimicrobial Stewardship program. She is a core faculty member within the Infectious Disease fellowship and is excited to work with fellows on iteratively improving its Antimicrobial Stewardship track. Her hobbies these days primarily center on chasing around her 1.5 year-old toddler, but also include traveling, hiking, and trying new restaurants.
Peter Wright, MD received his MD from Harvard Medical School, followed by training at NIAID and then residency and fellowship at Children's Hospital in Boston. He subsequently had an extensive research career at Vanderbilt (where he was Professor of Pediatrics, Professor of Microbiology and Immunology, Professor of Pathology, and Chief, Division of Pediatric Infectious Disease), and came to Dartmouth part-time (split with Vanderbilt) in July 2007. In July 2008, he transitioned to full-time at Dartmouth. Dr. Wright's research interests have revolved around viral pathogenesis and vaccine development. In addition, he has provided leadership for a large HIV treatment clinic in Haiti that has become a model of success for antiretroviral therapy in a resource-limited setting.
At Dartmouth he heads the development of a Clinical Translational Research Core and has support for the evaluation of novel influenza vaccines. His primary clinical interest in is Pediatric Infectious Disease.