John T Nathanson, MD

Mary E. D'Alton, MD, is Chair of the Department of Obstetrics & Gynecology and the Willard C. Rappleye Professor of Obstetrics & Gynecology at Columbia University Irving Medical Center. She also serves as Director of Services at the Sloane Hospital for Women at NewYork-Presbyterian. Specializing in maternal fetal medicine, the majority of Dr. D'Alton's practice focuses on patients with high-risk pregnancies due to complex maternal or fetal conditions. At NYP/Columbia, she has implemented a multidisciplinary, coordinated approach to manage the highest risk pregnancies at the Carmen and John Thain Center for Prenatal Pediatrics, which opened in 2010, and the Mothers Center, which opened in May 2018. Her work to advance education, research, clinical practice, and policy development in women’s health has won national recognition. In 2013, Dr. D’Alton was elected as a member to the National Academy of Medicine (formerly the Institute of Medicine). As co-chair of ACOG District II's Safe Motherhood Initiative, Dr. D’Alton has played a pivotal role in the effort to reduce maternal mortality and morbidity in New York State and in the national conversation about how to improve maternal health. Honored with a Lifetime Achievement Award in 2006 by the Society for Maternal Fetal Medicine, she has served as its president and has held key positions in several professional organizations, including the American Gynecological and Obstetrical Society (AGOS) and the American College of Obstetricians and Gynecologists (ACOG). The author or contributor to over 200 publications, Dr. D'Alton is co-editor of Seminars in Perinatology and has served on the editorial board of ACOG's Obstetrics and Gynecology.

Dr. Alia Koch DDS, MD, FACS is an assistant professor at Columbia University's College of Dental Medicine in the Department of Oral and Maxillofacial Surgery. She has been named Program Director of the Residency Program at New York Presbyterian, as well as a Fellow in the American College of Surgeons. Dr. Koch has also been awarded a position as a LEAD Physician by the NYP LEAD Academy, a physician leadership and career development program at NewYork-Presbyterian Hospital. Dr. Koch is a graduate of Columbia University's Vagelos College of Physicians and Surgeons, as well as the College of Dental Medicine. She completed the Oral and Maxillofacial Surgery Residency at NewYork-Presbyterian Hospital/Columbia University Medical Center. During her residency at Columbia, completed a General Surgery Internship at New York Presbyterian Hospital. Upon completion of her residency, Dr. Koch started practice at Columbia University Medical Center and New York Presbyterian. In addition to her administrative and teaching responsibilities, Dr. Koch practices full scope Oral and Maxillofacial Surgery. Dr. Koch also participates in multiple NIH funded research protocols, and has been published in several peer reviewed journals. She also has written multiple textbook chapters and board review books.

Dr. Krigel is a graduate of Dartmouth College, where she majored in Biological Sciences and minored in Spanish. She received her MD from New York University School of Medicine in 2013, then completed her internship, residency, and chief residency in internal medicine at Columbia. She stayed on for fellowship in Digestive and Liver Diseases, during which time she published multiple papers on topics related to colon cancer screening, early onset colorectal cancer, and colonoscopy quality. She also earned a Masters in Patient Oriented Research from the Department of Biostatistics at the Mailman School of Public Health. Dr. Krigel joined the faculty of the Division of Digestive and Liver Disease at Columbia University Irving Medical Center in 2020. She continues to be involved in trainee education as the Associate Program Director of the DLD Fellowship Program, and she participates in cross-campus colonoscopy quality initiatives as the Associate Director of Colonoscopy Quality for the division. Dr. Krigel is fluent in Spanish.