He was an assistant resident at Duke for 6 months.[1] He then spent the first half of 1949, in a pediatric fellowship in England and France, at L'Hôpital des Enfants Malades (Paris) and at Guy's Hospital and Great Ormond Street Hospital (both in London).[7] Next, he served as assistant chief, then chief resident for another year and a half at Children's Hospital in Washington, D.C..[7] In 1951, he was a study of pulmonary pathology at Harvard Medical School and Boston Children's Hospital.[7]