City Attorney of Galena (1885-1892 & 1901-1903), Probate Judge of Cherokee County for two terms (1896-1899?), Judge of the Court of Common Pleas for one term (1899-1900), and District Court Judge for one term. "Since July 5, 1904, Judge Sapp has been the senior member of the law firm of Sapp & Brown, having offices in the Opera House Block, which he erected in 1900. This firm has the most expensively furnished offices in the county, the suite consisting of public and private offices and a library of several thousand volumes." Later became president of Giant Mining & Royalties Co., a director of McCullagh Lead & Zinc Co., a director of Lockport Lead & Zinc Co., a director of Scarlet Kid Mining Co., and a director of Pioneer Lead & Zinc Co., as well as having large residential and commercial real estate interests (his law offices were located in the Sapp Building), and owned several hundred acres of farm land in the county. Also one of the leading Democrats of Cherokee County.