[2] During World War I, Angell served as an infantry Captain in the American Expeditionary Force, a part of the U.S. Army, in Europe.
[6] In 1948, he was selected by the U.S. Civil Service Commission to be chairman of the Loyalty Board for the second region, covering New York and New Jersey.
[7] From 1950 to 1969, Angell succeeded Dr. John Haynes Holmes to serve as president of the American Civil Liberties Union.
[9] Katharine, a Boston Brahmin, was a graduate of Miss Winsor's School and Bryn Mawr before becoming the fiction editor at The New Yorker.
[5] Before her death in 1970,[13] they were the parents of two children together:[2] Angell died at 156 East 66th Street, his home in Manhattan, on January 11, 1973, at age 83, after suffering heart problems.