Dr. Courtney Sandler, MD, MPH is a physician specializing in endocrinology. She earned her MD from Icahn School of Medicine at Mount Sinai. She then completed a combined internal medicine and pediatrics residency at Mt. Sinai Hospital as well as adult and pediatric endocrinology fellowships at Brigham and Women's and Boston Children's Hospitals. Dr. Sandler founded the pediatric endocrinology program at Atrius Health. She has expertise helping young adults transition from pediatric to adult care. Her comprehensive training enables her to care for patients with complex endocrine conditions throughout their lifespan in both pediatric and adult endocrinology, which is also her passion.