Theodore Johnson Angell was born to Truman Osborn Angell and Mary Ann Johnson on 3 January 1857 in Salt Lake City, Utah Territory. He married Catherine Elizabeth Willie on 27 June 1878 in Salt Lake City. Angell was a building contractor and a partner in at least two different Salt Lake City businesses specializing in architecture, contracting, and lumber dealing: Angell Bros., which dissolved in 1891, and T. J. Angell Lumber Co., which succeeded the former business that same year. By 1900, he was living in Tooele, Utah, but also spending time in Butte, Montana. Angell died on 15 August 1918 in Butte.
 “Old-Time Resident of Butte Is Dead,” Butte Miner, 17 Aug. 1918, 10; “Notice,” Salt Lake Herald, 16 Sept. 1891, 7; “Theodore J. Angell,” 1900 U.S. Census, Tooele Precinct, Tooele Co., UT, 13A; “Theodore J. Angell,” 1900 U.S. Census, Butte City, Silver Bow, MT, 4A; “Theodore Johnson Angell,” FamilySearch (Person ID: K27T-V5D), accessed 16 Apr. 2020, https://www.familysearch.org/tree/person/details/K27T-V5D.