Walter Antonio Zegarra, MD

Dr. Johnson is the director of the Fetal Heart Program in the Heart Institute at Johns Hopkins All Children’s. She joined the hospital team in 2021.She was previously a pediatric cardiologist at Ann & Robert H. Lurie Children’s Hospital of Chicago and an assistant professor of pediatrics in the Division of Pediatric Cardiology at Northwestern University Feinberg School of Medicine. Dr. Johnson has published a number of peer-reviewed articles, authored book chapters and given talks nationally. Her clinical expertise is in fetal and pediatric echocardiography, and the care of all children with heart disease. Her research interests center around value, cost and outcomes in congenital heart disease.Dr. Johnson completed her pediatric internship and pediatric residency at Oregon Health and Sciences University in Portland. She then completed a fellowship in pediatric cardiology at University of Utah at Primary Children’s Hospital, followed by a fellowship in advanced non-invasive imaging at Ann & Robert H. Lurie Children’s Hospital.She earned her medical degree from the University of Pittsburgh School of Medicine. She also earned a Master of Science in clinical investigation from the University of Utah in Salt Lake City.

Dr. Irani practices in the Sports Medicine program and serves as director of the pediatric sports medicine fellowship program at Johns Hopkins All Children’s Hospital.She is one of the Co-Leads of the Comprehensive Concussion Clinic in collaboration with Danielle Ransom, Psy.D., from Neuropsychology. This multidisciplinary clinic provides specialty care to children and adolescents with prolonged recovery from concussion.After graduating from Florida State University College of Medicine, Dr. Irani completed a residency in pediatrics at the University of Florida followed by a pediatric and adult sports medicine fellowship at All Children’s Hospital and Bayfront Medical Center. During her fellowship, she served as part of the physician team providing coverage for athletic teams at the University of South Florida and Eckerd College as well as youth and NCAA events.She is involved in a research study through the Johns Hopkins All Children's Institute for Brain Protection Sciences that follows a group of youth athletes to learn more about the effects of sports-related concussions on a child’s neuropsychiatric, neuropsychological, and cognitive functioning.

Dr. Grana specializes in pediatric hematology/oncology in the Johns Hopkins All Children’s Cancer & Blood Disorders Institute. She joined the hospital medical staff in 1992.Dr. Grana earned her medical degree from the University of Puerto Rico School of Medicine. She trained in pediatrics at University Children’s Hospital in San Juan, Puerto Rico, and completed a pediatric hematology/oncology fellowship at the University of Florida.