Dr. Yarnoff started practicing pediatrics in Lansdale in 1993. She completed her under-graduate education at Franklin and Marshall College and received her medical degree from Temple University School of Medicine. She completed her pediatric residency at the Medical Center of Delaware / A.I. Dupont Hospital for Children.

Dr. Yarnoff is a fellow of the American Academy of Pediatrics and is board-certified with the American Board of Pediatrics.

Dr. Yarnoff resides in the North Penn School District with her husband, Bill, and their two children.