Dr. David Sas is a Pediatric Nephrologist at Mayo Clinic who specializes in urinary stone disease, especially rare, genetic forms of urinary stone disease. At Mayo Clinic, he is also the Co-Director of the Renal Laboratory, Co-Director of Pediatric Program in the Department of Laboratory Medicine, Director of Patient Experience for Pediatrics, and Director of the Patient and Family Advisory Council. He grew up in New York, then attended college at Tulane University in New Orleans, Louisiana, where he majored in Political Economics. He stayed in New Orleans to earn a Master's Degree at the Tulane School of Public Health and Tropical Medicine. He then attended medical school at the Arizona College of Osteopathic Medicine before his residency training in Pediatrics at Inova Fairfax Hospital for Children in Northern Virginia. After a year as Chief Resident of Pediatrics, he went to University of Texas Southwestern Medical Center for Pediatric Nephrology fellowship. His first faculty position was at the Medical University of South Carolina in Charleston, SC where he developed his specialization in pediatric kidney stone disease. In 2014, he joined the faculty at Mayo Clinic and further established his expertise in urinary stone disease and genetics.