He attended the University of Denver for eighteen months and then enlisted in the United States Military.
[1] Following graduation, he was hired by the Federal Bureau of Investigation and was assigned to posts in Alabama and New York before taking a position in Durango, Colorado.
He retired from the FBI in 1974 and worked for a time for the La Plata County Sheriff's Office.
[4] Following this loss, DeNier re-entered politics in 1986, running to represent District 6 in the Colorado Senate.
In the race, he defeated Democrat Ann Brown and served a single four-year term in the senate, his last elected position.