Current Fellows

Third-Year Fellows

  • Jenny Gartshteyn, MD

    Dr. Jenny Gartshteyn was born in Kharkov, Ukraine but spent most of her adult life in NYC. She completed her medical training at the New York University School of Medicine. While working as a hospitalist several years later, she discovered her passion for rheumatology - she is now a rheumatology fellow at Columbia University Medical Center. During her free time, she enjoys theater, historical fiction, and hiking.

    Jenny Gartshteyn, MD
  • Christian Geier, MD

    Dr. Christian Geier grew up in Germany and attended medical school in Vienna, Austria. He moved to the US after visits to the National Institutes of Health and George Washington University where he completed his residency training. He became intrigued with Rheumatology after working with patients with complex immune system abnormalities and experiencing the fascination of attempting to solve diagnostic challenges and mysteries in these special patients.

    As a post-doctorate fellow at Columbia University, Dr. Geier’s research focuses on a group of specialized immune cells called dendritic cells. These are star-shaped cells distributed throughout the body that have evolved to coordinate the immune system through interaction with other immune cell types. Due to their important immune mediating capabilities these cells likely play important roles in how autoimmune conditions (such as Rheumatoid arthritis and Lupus Erythematosus) start initially and are then maintained in their chronic state.

    As a member of the lab of Dr. Robert Winchester, one of his responsibilities is the integration, visualization and analysis of clinical and flow cytometry data through by using various bioinformatics approaches.

    Additional research information can be found on Dr. Christian Geier’s academic website

    In his free time, he enjoys running, Greek and Roman mythology, and - after a long day of work - an occasional cold Pilsner beer.

    Christian Geier, MD

Second-Year Fellows

  • Daniel DeMizio, MD

    Dr. Daniel DeMizio is currently a rheumatology fellow at Columbia University Irving Medical Center. Born and raised in Staten Island, New York, he obtained his undergraduate degree in biology at the College of New Jersey. He then attended Albert Einstein College of Medicine, graduating with AOA honors, and subsequently completed his internal medicine residency at Mount Sinai Hospital in New York City.

    Dr. DeMizio’s academic interests include scleroderma, vasculitis, spondyloarthropathy and medical education. Outside of medicine, he enjoys reading, improvisational acting, meditation, and traveling.

    Daniel DeMizio, MD
  • Jun Lee, MD

    Dr. Lee was born in Seoul, South Korea, but grew up in Argentina and the United States. He received his undergraduate degree in biochemistry/cell biology and Master of Science in biology at the University of California: San Diego. He attended medical school at the State University of New York at Buffalo and completed his internal medicine residency at Cedars Sinai Medical Center. His interests in rheumatology include rheumatoid arthritis,spondyloarthritis, and systemic lupus erythematosus. Outside of work, he enjoys watching movies, playing basketball, and spending time with his family.


    Jun lee, MD
  • Elizabeth Park, MD

    Dr. Elizabeth (Liz) Park was born and raised in Seoul, South Korea, until she moved to the US at the age of nine. She completed a seven-year combined BA/MD program at Boston University and her internal medicine residency at New York-Presbyterian/Cornell, where she trained in the primary care track and fell in love with Rheumatology after rotating through the Hospital for Special Surgery.

    She is interested in a clinical research career focusing on cardiovascular outcomes in Rheumatoid Arthritis patients, particularly heart failure and myocarditis. Her other clinical interests disparities in rheumatologic care as well as global Rheumatology.

    When not working she enjoys exploring all the culture NYC has to offer!

    Elizabeth Park, MD

First-Year Fellows

  • Michael Allen, MD

    Dr. Michael Allen was born and raised in Binghamton, New York. He received his bachelor's degree in biology from The College of Saint Rose in Albany, New York before attending the Sackler School of Medicine in Tel Aviv, Israel. He completed his internal medicine residency at Mount Sinai Hospital prior to becoming a rheumatology fellow at Columbia.

    His interests within rheumatology include connective tissue disease related ILD and expanding/improving care in resource poor settings. Outside of medicine, he enjoys spending time with family and playing golf.

  • Amanda Nussdorf, MD

    Dr. Amanda Nussdorf was born and raised on Long Island, New York. She received her undergraduate degree in exercise science at The University of Delaware and attended medical school at the State University of New York at Downstate Medical Center. She completed her internal medicine residency training at New York-Presbyterian/Columbia University Medical Center and is grateful and excited to be staying as a Rheumatology fellow.

    Some of Amanda's interests outside of medicine include going to museums and art exhibits, playing golf, traveling, and trying new restaurants.

  • Nancyanne Schmidt, MD

    Dr. Nancyanne Schmidt was born and raised in New York City. She received her undergraduate degree in Public Health from The Johns Hopkins University and Master of Biomedical Science degree from Rutgers University, prior to completing a research fellowship at the National Institutes of Health. She attended medical school at Stony Brook University and completed her internal medicine residency at NYU Langone Medical Center.

    Dr. Schmidt’s research interests include global health, systemic lupus erythematosus and cardiopulmonary manifestations of rheumatologic diseases.

    Outside of work, she enjoys yoga, travel and reading. She is excited to spend the next few years at Columbia and continue exploring NYC!