Donald Phillibert Jr., MD

Dr. Ioan-Florinel Frunza specializes in Neonatal and Perinatal Medicine and is affiliated with New York Presbyterian and Columbia University Irving Medical Center. He serves as an Assistant Professor of Pediatrics, contributing to the education and training of future medical professionals. Patients can access a range of services through the Columbia Connect app, which facilitates appointment management, communication with healthcare providers, and access to medical documentation. The practice is dedicated to providing comprehensive care for children, ensuring a focus on patient safety and well-being. Generated from the website

Kelley Yan, MD, PhD, is a physician-scientist trained in diverse disciplines including clinical gastroenterology, structural biology, and stem cell biology. This multidisciplinary background provides her with a unique perspective and opportunity to study intestinal stem cell (ISC) biology at the molecular, cellular, and tissue levels. Her love of science began with an appreciation for undergraduate studies in chemistry and the physical sciences, which evolved during graduate school into a desire to understand how 3D structure or molecular form enables biological function and confers specificity in protein-protein or protein-nucleic acid interactions. She has experimentally examined these interactions in signal transduction—particularly ligand/receptor interactions—using structural biology and biophysical methods. Her medical training deepened her passion for clinical gastroenterology and guided her toward regenerative medicine, fueled by a personal commitment to serving her patients. As a postdoctoral fellow, Dr. Yan pursued further scientific training in ISC biology and developed expertise in rigorous mouse genetics, in vivo models, ex vivo 3D organoid culture systems, and single-cell genomics to study stem cell fate decisions.

Ryan Lawrence joined the faculty in 2014 as an inpatient psychiatrist on 9 Garden North (Milstein Hospital). He then served as unit chief of 3 River East, a 30 bed MICA inpatient unit located at the Allen Hospital. He is currently the director of the Comprehensive Psychiatric Emergency Program at Columbia University Medical Center. His writing is focused on topics related to ethics and patient safety.