Current Fellows

Second-Year Fellows

Andy Nguyen, MD

Dr. Andy Nguyen was born and raised in Albuquerque, New Mexico and attended The University of New Mexico for his undergraduate studies and received a BS in Biology with honors. He then moved to the Midwest and completed his undergraduate medical training at Saint Louis University School of Medicine.

Finally, his journey brought him to New York City where he completed his Internal Medicine residency at Montefiore Medical Center in the Bronx. He is excited to be training with the amazing faculty within the division of Rheumatology at Columbia University.

Clinically, he has an interest in general Rheumatology and is looking forward to further expanding his knowledge in the field. In his free time, Dr. Nguyen enjoys exploring the best of what New York has to offer including dining, events, nature, and culture.
Aradhna Agarwal, MD, MPH

Dr. Aradhna Agarwal grew up in Rockland, NY, where she has spent a lot of time hiking, and continues to do so today. She received her Bachelor in Science at Tufts University where she majored in Biology and Community Health. Dr. Agarwal went to medical school at the Ohio State University and then pursued a gap year to complete a Master in Public Health at the Columbia University Mailman School of Public Health. She then went on to complete her internal medicine training at UT Southwestern. In addition to hiking, Dr. Agarwal also enjoys running, cooking, and reading in her spare time.
Reid Weisberg, MD

Dr. Reid Weisberg was born and raised in Dallas, Texas and graduated from the University of Virginia, where he earned a B.A. in Biology with distinction, and completed a minor in History. He then returned to his home state to attend medical school at Baylor College of Medicine in Houston and completed his residency in Internal Medicine at UT Southwestern Medical Center in Dallas. His interests include medical education and quality improvement. In his spare time, Dr. Weisberg enjoys road tripping around the country, trivia, comedy, reading, writing, music, and enjoying nature.

First-Year Fellows

Karen Gambina, MD, MPH

Dr. Karen Gambina is originally from Queens, New York, and Long Island. She received her undergraduate degree, graduate degree in public health, and medical degree from Columbia University. She then completed her residency at NewYork-Presbyterian/Weill Cornell Medical Center. Dr. Gambina's academic interests include systemic autoinflammatory diseases, medical education, and health disparities. Outside of work, she enjoys walking, traveling, and trying new foods.
Giovanna Rosas, MD

Dr. Giovanna Rosas was born and raised in Lima, Peru. She attended Cayetano Heredia University in her hometown. She then completed her internal medicine residency at University of Alabama at Birmingham prior to joining Columbia as a rheumatology fellow. Her interests in rheumatology include exploring novel interventions to improve patient outcomes, working in health disparities and caring for underserved patients. Outside work she enjoys dancing, exploring local restaurants and sights. She is thrilled about moving to NYC and enjoying what the city has to offer.
Caroline Atlas, MD

Current Fellows

Second-Year Fellows

Andy Nguyen, MD

Aradhna Agarwal, MD, MPH

Reid Weisberg, MD

First-Year Fellows

Karen Gambina, MD, MPH

Giovanna Rosas, MD

Caroline Atlas, MD