Born January 28, 1932 in Salt Lake City, Utah, Dennis ended up in Evanston, Wyoming. He quit high school and joined the 141st Tank Battalion of the Wyoming National Guard. When the Korean War started in 1950, his unit was called to active duty in September, but he and his wife, Sandy got married on July 26, 1950 before he left for active duty, and to serve in Korea. Dennis and Sandy settled in Evanston, where he served three 4-year terms as a member of the Evanston city council and three 4-year terms as mayor. Dennis retired at the age of 81 from his real estate agency, and after raising four sons and over 68 years of marriage, he and his wife Sandy still reside in Evanston.