Sidney Roxton Whitmore is the son of Roxton and Adella Whitmore. He was born in St. Thomas, Nevada on December 31, 1921. He graduated from Overton High School and served in the Army during World War II. He met and married his wife, Suzette Fortune Ziza, in 1946 while stationed in Algeria. After the war, the couple returned to the United States and Whitmore earned his law degree at George Washington University. He practiced law in Las Vegas. The Las Vegas City Commission appointed him city attorney in 1960 and he was later reelected. He also worked in real estate and as a rancher. He died in Las Vegas on February 1, 2003.