During my pediatric cardiology fellowship at Columbia-Presbyterian Medical Center, I first became interested in the impact of congenital heart disease on a child’s ability to exercise. After completing my fellowship I worked for two years as a staff pediatric cardiologist at Downstate Medical Center in Brooklyn NY. I then joined the faculty at Tufts Medical Center and started an exercise physiology program there. I ultimately became the chief of Pediatric cardiology and served in that role until November 2002, when I joined Boston Children’s Hospital’s Pediatric Cardiology Department and became Director of the Exercise Physiology Laboratory. In addition to caring for patients with cardiovascular disease, I have engaged in extensive clinical research focusing upon the effect of congenital heart disease on a patient’s exercise function, the benefits of exercise in this population and the insights that exercise physiology testing can provide about the health of these patients. I have also studied novel ways of assessing a patient’s heart function and explored novel treatment approaches for patients with muscular dystrophy and patients with Fontan physiology.