Folsom was born in Portsmouth, New Hampshire. By the age of 16 he held a supervisory position in his father's contracting firm. Folsom directed up to hundreds of employees on dock projects around Lake Erie. He and his father then moved to Buffalo, New York, where they ran a building business. In New York Folsom met his future wife Zervial Eliza Clark, whom he married at age 22 on August 12, 1837. Folsom also encountered Latter Day SaintstonemasonEnoch Reese, who helped convert him to Mormonism. Folsom and his wife were baptized members of the Church of Jesus Christ of Latter Day Saints in a frigid Niagara River on February 17, 1842. Folsom and his wife traveled to Nauvoo, Illinois, in the spring of 1842. Nauvoo was then headquarters of the church, and Folsom became an acquaintance of Joseph Smith, the church's founder.
Early career
Folsom worked on the Nauvoo Temple until its completion in May 1846, when Mormons were forced from Nauvoo. He worked on the temple with Truman Angell and Miles Romney both of whom became lifelong friends. At this point Folsom moved to Keokuk, Iowa. In 1851 he traveled to the Sacramento California area to the town of Rough and Ready where he worked on water projects that were needed to mine gold. He then returned to his family in 1852. Folsom committed to follow Brigham Young to the Salt Lake Valley. In 1854, he set out for Salt Lake City but arrived at Council Bluffs, Iowa, ten days too late to join the last company west. Instead, he stayed at Council Bluffs for six years employed as a builder. Notably, he worked on columns for the Nebraska Territory capitol building, which were transported across the Missouri River from Council Bluffs to Omaha. In 1860, Folsom finally set out for Utah Territory with a relatively large outfit of four wagon teams. Soon after his October 3 arrival in Salt Lake City, Folsom opened shop on Main Street downtown. Brigham Young, president of the LDS Church, put him to work on church projects almost immediately. He was sustained as Church Architect in the October 1861 General Conference.
Architect
Folsom worked prolifically in the 1860s. By 1864, he was planner in two constructions firms, one was with Miles Romney. Folsom himself drew the plans or was involved in the construction of many historic Utah buildings including the Old Salt Lake Theater, the Salt Lake Tabernacle, the Salt Lake City Council Hall, the Provo Tabernacle, the Provo Theater, the Moroni Tabernacle, and the original ZCMI building in downtown Salt Lake City. Folsom also had ecclesiastical duties in the LDS Church, serving first as a stake high councilor and then as first counselor in the Salt Lake Stake Presidency in 1874. In 1867, Truman O. Angell, who had recovered from poor health, was again made church architect and Folsom was made his assistant. In 1877, while serving as an assistant to the church architect, Folsom was called by the LDS Church to design the Manti Temple; Folsom lived in Manti, Utah, until the temple's completion in 1888. Returning to Salt Lake City, he was building inspector under Mayor John Clark until 1890. Folsom served some of his last years as an LDS Church stake patriarch before his death.
