In 1888 or 1890, he was appointed a clerk in the United States marshal's office in Los Angeles, and began to study law. In 1892 he was appointed assistant United States attorney under Mathew Thompson Allen. In 1883 he resigned and formed a law partnership with Allen, Allen & Flint, which lasted two years until Allen became a judge. In 1895, Flint and Donald Barker reformed the law firm as Flint & Barker. In 1897 Flint was appointed United States attorney for the southern district of California, and served four years. Flint was active in Republican politics. He was a fruit-grower, politician and banker. In Los Angeles he was a member of the chamber of commerce and of its law committee; a member of the Municipal League, the Sunset club, the
California Club, the Union League Club, the Republican League, the Masonic order and Knights Templar. He attended the Presbyterian Church, was a trustee of
Occidental College, a director of two banks (Equitable Savings, Los Angeles National). He served as
United States Attorney for the Southern District of California from 1897 to 1901 and as a
U.S. Senator from
California from
1905 until 1911 as a
Republican, and holds the distinction of being the 1000th senator in overall seniority. Flint served one term in the Senate and did not seek reelection. Flint was elected as president of the board of trustees of Occidental College in 1914. Flint served as chairman of the National Boulder Dam Association and advocated for the building of the Boulder Dam (later renamed the
Hoover Dam). In 1915, he became president of the Los Angeles Investment Company. He served in that role until his resignation in October 1928. ==Personal life==