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Howard Humphreys entered into practice as a consulting engineer with Trant Brown in 1899. In 1911 Henry Howard Humphreys took one of his sons, Cecil Lee Howard Humphreys (1893 - 1941), into the firm and his second son, Guy Howard Humphreys (1896 - 1951), in 1918. In 1930, upon his father's death, Cecil Lee Howard Humphreys succeeded as senior partner to the firm. With his brother - Guy - he authored a book entitled The Training of a Civil Engineer (1932).
In the 1980s Howard Humphreys was bought by Brown & Root, which became Halliburton, then Kellogg Brown & Root and at the time of writing (2020) is now KBR.
Howard Humphreys continued to act as consultant engineers for the bridge until 2006.