For more than 50 years, comedian Jack Benny was a star of radio, the stage and screen. His radio show, The Jack Benny Program, was a forerunner of the sitcom genre.
Film and TV actor Jack Black appeared in the popular comedy films Shallow Hal, High Fidelity and Tropic Thunder, and is the voice of Kung Fu Panda.
Jack Bruce is considered one of greatest bassists of all time. As the lead singer and bass guitarist for the band Cream, he wrote and sang "Sunshine of Your Love" and "White Room," among several other hits.
Jack Dempsey -- known as the "Manassa Mauler" -- was the world heavyweight boxing champion from 1919-1926.
Jack "Legs" Diamond was a Prohibition-era mob leader, hit man and bootlegger who was based in New York.
Jack Dorsey is an American businessman best known as the founder of the social networking site Twitter.
Jack Hanna, animal expert and former director of the Columbus Zoo, makes regular appearances on TV talk shows to teach people about exotic animals.
Jack Johnson, nicknamed "the Galveston Giant," was the first African American world heavyweight boxing champion.
Jack Kerouac was an American writer best known for the novel On the Road, which became an American classic, pioneering the Beat Generation in the 1950s.
Jack Kevorkian was a U.S.-based physician who assisted in patient suicides, sparking increased talk on hospice care and "right to die" legislative action.
Jack Kilby was an American physicist and electrical engineer who co-created the integrated circuit.
Jack Klugman is an American actor best known for his role as Oscar Madison in the Broadway play The Odd Couple and the TV series of the same name.
The "godfather of fitness," Jack LaLanne, is known for his 1950s TV fitness program and for his endorsement of a power juicer in 2002.
The winner of two Oscars, Jack Lemmon was one of Hollywood’s finest actors, known for his roles in films like Some Like it Hot and The Odd Couple.
American artist Jack Levine is best remembered for his American Social Realist paintings, including "Gangster Funeral," which satirized corruption in the modern world.
Jack London was a 19th century American author and journalist, best known for the adventure novels White Fang and The Call of the Wild.
Jack Rowland Murphy is a convicted jewel thief and murderer who served 19 years of a double life sentence before being released.
Jack Nicholson is one of the most prominent American motion-picture actors of his generation, noted for his versatile portrayals of unconventional outsiders
Professional golfer Jack Nicklaus, nicknamed "the Golden Bear," won the U.S. Open four times and the Professional Golfers Association championship five times.
Jack Paar had no singing, dancing or acting talent, but he was blessed with "the gift of gab." That gift was enough to endear him to millions of American television viewers during his tenure as host of The Tonight Show (1957-1962).
Jack Palance was an American actor best known for playing villainous roles in the 1960s and for his award-winning appearance in the film City Slickers.
Nightclub owner Jack Ruby murdered Lee Harvey Oswald before Oswald could stand trial for the assassination of President John F. Kennedy.
Actor Jack Wagner rose to fame as the rocker Frisco Jones on the daytime soap opera General Hospital.
Jack White is best known for singing and playing guitar with Meg White in the band the White Stripes.