In 1928, after considering graduate study at Harvard, Hull turned down an offer from "a relative to join him in the feed‐manufacturing business" and, instead, became a salesman for Mutual Life Insurance Company of New York in Meridian, Mississippi. He was an organizer of the first Mississippi Junior Chamber of Commerce, eventually becoming its president. He also served as president of the Meridian Chamber of Commerce, was a trustee of the city library and vice president of the Kiwanis.[1] In 1932, Hull was appointed district manager for MONY in Meridian and in 1935, he was made manager of the company's agency in Nashville. In 1938, he moved to New York as assistant superintendent of agencies,[4] before becoming executive vice president and a trustee in 1950.[5] In June 1959, he was named president and chief executive officer.[6] In 1969, he was named chairman and chief executive of Mutual Life while J. McCall Hughes became president.[7]
Hull was "credited with devising his company's program for the lifetime compensation of agents in an effort to encourage men to make careers as insurance salesmen."[1]
He was elected one of three public governors of the New York Stock Exchange in 1969,[8] and was chairman of the American College of Life Underwriters. He had also served as chairman of the Life Insurance Association of America, a director of the Million Dollar Round Table, Academy of Political Science, the Health Insurance Institute, the New York Better Business Bureau, chairman of the Religion in American Life program, a member of the Salvation Army New York advisory board, a trustee the Atlantic Mutual Insurance Company,[9] a trustee of the United Presbyterian Foundation and chairman of Billy Graham's 1957 New York Crusade.[1]