Current Fellows

Third-Year Fellows

  • Jae Hee Yun, MD

    Dr. Yun is currently a Rheumatology fellow at Columbia University Medical Center. She completed her undergraduate degree in Biology and Economics at Colby College. She then received her medical degree from the Medical College of Georgia and completed her residency in internal medicine at UT Southwestern in Dallas, TX. She worked one year as a hospitalist at Columbia University Medical Center before the start of her fellowship.

    JaeHee's primary interests are in systemic lupus erythematosus and rheumatoid arthritis. She enjoys yoga, hiking, cooking, and traveling.

    Jae Hee Yun, MD

Second-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 became interested in Rheumatology after experiencing its diagnostic challenges and mysteries during medical school and residency training. What motivates him most is when he can see research advancements benefiting patients directly at their bedside.


    He is a strong believer in data science as a means to improve lives of rheumatology patients and to make clinicians’ and researchers’ work easier and more productive.


    A native European who grew up in a small village, Christian is looking forward to the pace of New York City life with both excitement and awe. Outside of rheumatology, he enjoys running, Greek and Roman mythology, and - after a long day of work - an occasional cold Pilsner beer.

    Christian Geier, MD
  • Shuwei Wang, MD

    Dr. Shuwei Wang received her undergraduate degree in Neuroscience from McGill University and attended medical school at Rutgers Robert Wood Johnson Medical School in New Jersey. She discovered her passion for rheumatology while conducting clinical epidemiology research in psoriasis at the University of Pennsylvania and working closely with the Rheumatology Department during her residency in internal medicine at Thomas Jefferson University Hospital in Philadelphia. Dr. Wang’s academic interests include systemic lupus erythematosus, inflammatory arthritis, and clinical research using large patient databases. During her free time, she enjoys dance fitness, table tennis, and spending time with her family.

    Shuwei Wang, MD

First-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 systemic lupus erythematosus, scleroderma, vasculitis, 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 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 NewYork-Presbyterian/Cornell, where she trained in the primary care track and fell in love with rheumatology after rotating through the Hospital for Special Surgery. Her interests include medical education, global health, and providing care in resource limited settings. She is excited to spend the next few years at Columbia and exploring more of what NYC has to offer!

    Elizabeth Park, MD