 Their son Avery Dulles (1918–2008) converted to Roman Catholicism, entered the Jesuit order, and became the first American theologian to be appointed a Cardinal.Upon graduating from law school and passing the bar examination, Dulles joined the New York City law firm of Sullivan & Cromwell, where he specialized in international law.After the start of World War I, Dulles tried to join the United States Army but was rejected because of poor eyesight.