Dr. Fernandez Nievas specializes in pediatric critical care medicine at Johns Hopkins All Children’s. He joined the hospital staff in 2020. He previously served as an attending physician in pediatric critical care and medical director of pediatric extracorporeal membrane oxygenation (ECMO) at Upstate Golisano Children’s Hospital in Syracuse, New York, and medical director of pediatric respiratory therapy at Upstate University Hospital in Syracuse.