British-born Mark Burnett produced and directed a number of highly popular shows in the United States, including Survivor and The Apprentice.
Mark David Chapman is a U.S. convicted murderer and former security guard, best known for shooting and killing Beatles member John Lennon.
Famous in the NBA for his zealous management of the Dallas Mavericks, entrepreneur Mark Cuban has also owned multiple Internet startups and a theater chain.
Computer scientist and engineer Mark Dean is credited with helping develop a number of landmark technologies, including the color PC monitor, the Industry Standard Architecture system bus and the first gigahertz chip.
Television producer Mark Goodson created many of the best-loved game shows of the 20th century, including What's My Line, The Price is Right and Family Feud.
TV star Mark Harmon has been on long-running shows like St. Elsewhere, Chicago Hope and NCIS.
An influential teacher in the 19th century, theologian Mark Hopkins stressed moral values over intellectual achievement and self-education over dogmatic education.
One of the most powerful hitters in baseball history, Mark McGwire briefly held the record for most home runs in a single season.
Olympic medalist Mark Phillips is renowned as the commoner who married Princess Anne.
Russian-born painter Mark Rothko was a pioneer of the Abstract Expressionist movement during the mid-20th century.
Mark Ruffalo is an actor who has become known most recently for his portrayal of Bruce Banner/The Hulk in the movie The Avengers.
Apostle Saint Mark was one of Christ's 70 disciples, one of the four evangelists and the traditional author of the second Gospel, The Book of Mark.
American swimmer Mark Spitz set a world record at the 1972 Olympic Games, when he won seven gold medals across individual and team events.
An adventurer and wily intellectual, Mark Twain wrote the classic American novels The Adventures of Tom Sawyer and Adventures of Huckleberry Finn.
Mark Wahlberg got his start headlining the musical group Marky Mark and the Funky Bunch, later going on to a modeling career and acting success in Hollywood.
Mark Zuckerberg is co-founder and CEO of the social-networking website Facebook, as well as one of the world's youngest billionaires.