His character Detective John Munch, whom he has played continuously on "Homicide: Life on the Street" (1993) and "Law & Order: Special Victims Unit" (1999) since January 1993, is currently the longest-running character on U.S. prime-time drama television.

Appeared on the 25 March 1978 episode of "Saturday Night Live" (1975) with Christopher Lee as the host and musical guest, Meat Loaf.

Has appeared in episodes of three different television series with Jesse L. Martin: "Law & Order" (1990), "Law & Order: Special Victims Unit" (1999) and "Law & Order: Trial by Jury" (2005).

Was an assistant emcee for the Comedy Central Presents: The N.Y. Friars Club Roast of Rob Reiner.

Became the third person to play the same character in six different prime-time TV series, playing Detective John Munch in "Homicide: Life on the Street" (1993) (originating series), "Law & Order" (1990) (crossover), "Law & Order: Trial by Jury" (2005)_ (crossover), "X Files, The" (1993)_ (crossover), "The Beat" (2000) (guest appearance in the short-lived UPN series), and "Law & Order: Special Victims Unit" (1999)_. He followed John Ratzenberger and 'George Wendt', who played Cliff Clavin and Norm Peterson in "Cheers" (1982), "St. Elsewhere" (1982), "The Tortellis" (1987), "Wings" (1990), "The Simpsons" (1989), and "Frasier" (1993). Belzer upped his record to seven series with a cameo appearance in the 4th-to-last episode David Simon's HBO series "The Wire" (2002)_ (Episode 5.7: "Took" originally airing February 17, 2008); the appearance brought the character of Munch full circle as the character was born out of Simon's first series, Homicide, and in the scene he is hanging out in a police bar commenting on his experience owning a bar, which he did in Homicide.

Has appeared in episodes of four different series with Sam Waterston: "Law & Order" (1990), "Homicide: Life on the Street" (1993), "Law & Order: Special Victims Unit" (1999) and "Law & Order: Trial by Jury" (2005).

Stepfather of Bree Benton.

Appeared on the 2 October 1976 episode of "Saturday Night Live" (1975) with Eric Idle as the host and musical guests George Harrison, Joe Cocker, and Stuff.

Was born on the same day that Anne Frank and her family were arrested by the Gestapo.

Appeared in episodes of three different series with Jerry Orbach: "Law & Order" (1990), "Homicide: Life on the Street" (1993), and "Law & Order: Special Victims Unit" (1999).

As of 2007, he is the only actor to play the same character in nine different series. He has played Detective John Munch in "Homicide: Life on the Street" (1993), "Law & Order" (1990), "The X Files" (1993), "Law & Order: Special Victims Unit" (1999), "The Beat" (2000), "Law & Order: Trial by Jury" (2005), "Arrested Development" (2003), "The Wire" (2002), and "Paris enquêtes criminelles" (2007). He followed John Ratzenberger and George Wendt, who played Cliff Clavin and Norm Peterson respectively in six series: "Cheers" (1982), "St. Elsewhere" (1982), "The Tortellis" (1987), "Wings" (1990), "The Simpsons" (1989) and "Frasier" (1993).

Born in Bridgeport, Connecticut

Was considered for the role of Clark Griswold in Vacation (1983).

Friend of George Carlin.

Supporter of the North Shore Animal League. Adopted a dog, a poodle-fox terrier), from the League.

A paper boy in his youth in Bridgeport, Connecticut, he later worked as a reporter for the Bridgeport Post and several other newspapers around the country. Other jobs included teacher, census-taker, jewelry salesman and dockworker.

Survived testicular cancer in 1984.

Was the audience warm-up comedian for "Saturday Night Live" in its premiere season and made three guest appearances on the show in 1976 and 1978.

He lives in France and speaks fluent French.

Was one of the original emcees at Rick Newman`s Catch a Rising Star, along with Elayne Boosler, in the mid to late 1970s.

Appears on the cover of Billy Joel`s "Turnstiles" album (1976).

His aunt and uncle (Henry Winkler`s parents) were survivors of the Holocaust.

Cousin of Henry Winkler.

Testified on behalf of a low-level criminal who ran onto the set of "Homicide: Life on the Street" (1993) while fleeing actual Baltimore police and surrendered to the actors; Belzer said the look on the guy`s face was sufficient punishment

Was going to appear in Chevy Chase`s movie, Modern Problems (1981), but scheduling conflicts could not be worked out. The date for the shooting of his scene was postponed twice and the day his scene was supposed to be shot, Belzer had a lucrative club date in New York, which was postponed at the last minute.

Auditioned for the role of Groucho Marx in the Tommy Tune production "A Day in Hollywood, a Night in the Ukraine." Belzer taught himself two songs from the 1930s ("Satin Doll" and "Brother, Can You Spare a Dime?"), but did not get the part.

Robert De Niro studied Belzer for his role in The King of Comedy (1982).

Played himself in the movie Fame (1980).

Became the third person to play the same character in six different prime-time TV series, playing Detective "John Munch" in "Homicide: Life on the Street" (1993) (originating series), "Law & Order" (1990) (crossover), "Law & Order: Trial by Jury" (2005)(crossover), "The X Files" (1993) (crossover), "The Beat" (2000) (guest appearance in the short-lived UPN series), and "Law & Order: Special Victims Unit" (1999). He followed John Ratzenberger and `George Wendt`, who played "Cliff Clavin" and "Norm Peterson" in "Cheers" (1982), "St. Elsewhere" (1982), "The Tortellis" (1987), "Wings" (1990), "The Simpsons" (1989), and "Frasier" (1993). Belzer upped his record to seven series with a cameo appearance in the 4th-to-last episode David Simon`s HBO series "The Wire" (2002)_ (Episode 5.7: "Took" originally airing February 17, 2008); the appearance brought the character of Munch full circle as the character was born out of Simon`s first series, Homicide, and in the scene he is hanging out in a police bar commenting on his experience owning a bar, which he did in Homicide.

Is a frequent guest on "The Howard Stern Radio Show" (1998).

Wrestler Hulk Hogan hurt him while demonstrating a wrestling move on a 1986 TV show called "Hot Properties" (1985). He was knocked unconscious and required stitches on his head. He sued Hogan for $5 million, but later settled out of court.