Dr. Steffan Sernich is a board-certified pediatric cardiologist at Nemours Children's Health. He received his medical degree from Universidad El Bosque, Escuela Colombiana de Medicina in Bogotá, Colombia, in 1991, and completed his pediatric residency training at the Children's Hospital at the University of Texas Medical Branch in Galveston, Texas. He then completed a fellowship in pediatric cardiology at Tulane University School of Medicine and Ochsner Foundation Hospital. Dr. Sernich also completed a second fellowship in pediatric cardiac critical care at Tulane University School of Medicine.

Dr. Sernich began working in private practice in Tucson, Arizona, and later returned to New Orleans to work in academic medicine at Tulane University School of Medicine. After Hurricane Katrina, he worked at Children's Hospital of New Orleans as Tulane faculty and later as Louisiana State University faculty. He initially served as an assistant professor and later as an associate professor of clinical pediatrics. During this time, he practiced as a a pediatric cardiologist and served as director of the Noninvasive Imaging Laboratory.

In July 2024, Dr. Sernich joined Nemours Children's Health and the University of Central Florida. He currently practices pediatric cardiology at the Port St. Lucie and Sebring outreach clinics.