Dr. Guerrerio is a pediatric gastroenterologist with a special interest in treating those with connective tissue disorders, especially Loeys-Dietz syndrome. He is the data manager for the Kasper Center of Excellence for Pediatric Genetic Syndromes and Aortopathies. Additionally, his clinical practice focuses on eosinophilic intestinal disease (esophagitis, gastroenteritis and colitis) as well as inflammatory bowel disease—especially in the context of immunodeficiency. He is the director of the Very Early Onset Inflammatory Bowel Disease Clinic.