John R. Arnold was an attorney whose family settled in Wyoming in 1870. He was the Uinta, Wyoming County Clerk (1888-1890) and then the Uinta County Treasurer (1890-1892). He was admitted to the Wyoming Bar in 1896, and went into the law firm of Hamm and Arnold (1897-1909). He was a District Judge in the Third Judicial District, Uinta County, Wyoming (1914-1933) He also was one of the owners of the Collett Mining Company, Inc. (1896) and the Giant Chief Mining Corporation (1897) in Utah. In Wyoming he was a director of the First National Bank of Evanston, and an owner of Mountain Fuel Supply Company.
From the description of John R. Arnold papers, 1878-1947. (University of Wyoming, American Heritage Center). WorldCat record id: 80574457