Dr. Johnson is a native of Annapolis, Maryland. After completing undergraduate studies at the University of Maryland, she coordinated research studies at Johns Hopkins University. She obtained her medical training at the Philadelphia College of Osteopathic Medicine, and completed her residency at Geisinger Medical Center in Danville, Pennsylvania, where she also served as chief resident. She practiced as a pediatric hospitalist for two years prior to joining Physicians to Children in 2004.
Dr. Johnson is a Fellow of the American Academy of Pediatrics, and a member of the AAP sections on nutrition and breastfeeding advocacy. Her outside interests include hiking, skiing, sewing, and cooking. Dr. Johnson and her husband, Russ, have a daughter, Corinne, and two sons, Brendan and Matthew.