Listen to Dean Martin online radio. Dean Martin was an Italian American singer, actor, comedian, and film producer. One of the most popular and enduring American entertainers of the mid-20th century, Martin was nicknamed the "King of Cool" for his seemingly effortless charisma and self-assuredness. He was a member of the "Rat Pack" and a star in concert stage/nightclubs, recordings, motion pictures, and television. He was the host of the television variety program The Dean Martin Show (1965–1974) and The Dean Martin Celebrity Roas