The child of immigrant parents from Barbados, Hamblin is a policeman's son. He served in the United States Army's 101st Airborne Division before becoming a photographer for the Detroit Free Press. In the late 1960's Ken was a producer and film cameraman with the Public TV channel in Detroit, WTVS, Channel 56. A major event he captured exclusively while at Ch. 56 was the release of radical leftist and beatnik/hippy/writer/poet/music producer John St.Clair from prison after serving time for marijuana possession. He began his radio career in the 1970s. He says he was once sympathetic to the radical left, including groups such as the Black Panthers, and gave them favorable coverage. However, as time went on, he felt the left had failed to make good on its promise to bring about the type of America it spoke of, and he began to move to the conservative side of the spectrum. This puts him in company with David Horowitz, Tammy Bruce, and others who made a left-to-right switch. Hamblin is a licensed fixed-wing pilot and a motorcycle owner. He is a father and grandfather.

Hamblin had a long-running local talk program on powerful KOA radio in Denver, a clear-channel station heard across the western and central United States. Hamblin hosted the early evening shift, which he worked the evening of June 18, 1984, when Alan Berg, one of the station's biggest and controversial hosts, was gunned down. He gained national attention when his show, then carried on another Denver radio station, was broadcast on CSPAN during the early 1990s. He was heard on KNUS and KXKL radio in Denver, as well as across the U.S. After his show was syndicated, he was heard across the United States on some 200 radio stations.

In 1999, Hamblin was named one of Colorado's Top 100 most influential media personalities.

Hamblin's show had several unique features: playing various versions of the Star Spangled Banner at the beginning of the show; playing Taps for fallen law enforcement officers; announcing the execution of convicts on death row, often with a clip from the movie Unforgiven, saying "It's a hell of a thing killin' a man; you take away everything he's got, and everything he's gonna have." This execution segment was notable for having the song, "Another One Bites the Dust" by the group, Queen. Hamblin frequently referred to liberals as "egg-sucking dogs", and sometimes challenged listeners to call in and name one major American city that improved after the city elected a liberal black mayor ("You can't do it"). He has also been an outspoken critic of Louis Farrakan and the Nation of Islam, challenging those unhappy with the United States to "pick a better country" and go live there.