Whitney North Seymour was born on 4 January 1901 in Chicago, Illinois, USA. He was married to Lola Vickers. He died on 21 May 1983 in Manhattan, New York City, New York, USA.
One son Whitney Jr (Huntington, West Virginia, 7July 1923- 29June 2019, Torrington, Connecticut) was also a prominent lawyer. The other Thaddeus Seymour born New York City, June 29, 1928, New York, was an university professor and president.