Television personality, talk show host. Born April 12, 1947, in Indianapolis, Indiana, to Harry Joseph Letterman, a florist, and Dorothy, a church secretary who now appears regularly as a correspondent on his late-night talk show. He has two sisters, Janice and Gretchen.

Letterman is best known for his gap-toothed self-mockery, and his brash, wry, somewhat cynical sense of humor, which was, at first, unconventional, attracting a cult following, but which has gone on to define the young, hip, media-savvy generation that is his main audience, and inspire countless comedians and talk show hosts who have followed him.

Letterman studied radio and television at Ball State University, in Muncie, Indiana (B.A. 1969). He worked in Indianapolis as a radio talk-show host; the host of a childrenÕs program and a late-night movie; a news anchor; and as a television weatherman, where his brand of humor was already evident, if not necessarily appreciated. One night he reportedly upset his bosses when he congratulated a tropical storm on being upgraded to a hurricane.

In 1975 Letterman moved to Los Angeles and wrote material for popular sitcoms, including Good Times. His big break came when he began appearing on The Tonight Show with Johnny Carson, whom he has since referred to as his mentor. In 1978, he became CarsonÕs regular guest host, and in 1980, he was offered his own show, the daytime David Letterman Show. The show only lasted for three months, but was a critical success, and convinced NBC-TV to give the young comedian a late-night show following CarsonÕs.

The late-late show hour was well-suited to LettermanÕs brash and quirky humor. Late Night with David Letterman soon became popular with a young audience by mixing the usual talk-show ingredients of celebrity guests and music with his irreverent manner and zany comic stunts. His signature features include The Top Ten List; Stupid Pet Tricks (along with its companion, Stupid Human Tricks); Viewer Mail; and pencils tossed at the camera and at the set behind him, ÒbreakingÓ the non-existent glass with a cued crash sound. He is also known for his parody sketches that play upon the obvious weak acting abilities of his bandleader Paul Schaffer (and other members of The WorldÕs Most Dangerous Band), stage-hand Biff Henderson, and general odd-ball Larry Bud Melman.

After NBC-TV chose Jay Leno as the replacement for the retiring Johnny Carson, in 1993, a position Letterman had publicly desired, Letterman moved to CBS-TV, with a lucrative deal to host The Late Show with David Letterman, which airs opposite The Tonight Show with Jay Leno. His displeasure with NBC executives was fodder for his monologues, and when they blocked him from transferring regular features of his show to CBS (claiming it was NBCÕs Òintellectual propertyÓ) that too was mocked on air. The years that followed this head-to-head competition spawned a book and cable movie documenting the late-night talk show Òwars.Ó Letterman has received several Emmys for both writing and for his talk show hosting duties.

Letterman is exceedingly private about his personal life (besides his penchant for receiving speeding tickets). Letterman was married, to Michele Cook, from 1969-1977, and was romantically involved with comedienne/writer Merrill Markoe, and production manager Regina Lasko.

On January 14, 2000, fans were shocked to learn that Letterman underwent quintuple heart bypass surgery. In typical Letterman fashion, the recovering patient joked that "in addition to rerouting the arteries, they also installed an E-Z pass." Letterman's first post-op show aired on February 21, featuring Regis Philbin, Jerry Seinfeld, Robin Williams (wearing medical scrubs), and eight members of the team who took care of Letterman during his stay in the hospital.