The field of pediatric cardiology was in its early stages of development when the author of this book began his career in the mid-1960s, meaning that he was able to witness the stepwise evolution of the field over the last 50 years. This book presents this unique historical perspective, describing the development of new knowledge while providing care of patients with heart disease over this time period. It brings together advances made in the field, particularly regarding the management of congenital heart defects.