Jack Black (b. 1969) is an actor, comedian and musician, known for his work in films and as half of the comedy rock duo Tenacious D.
In 2008, Black guest starred on Sesame Street Season 39, appearing in Word of the Day segments to demonstrate "Octagon" and "Disguise" with Elmo and in a Backstage with Elmo segment for Sesamestreet.org. For the word "disguise," Black "wore" an elaborate chicken costume (which was a refurbished version of the Humongous Chicken), lending his own voice to the puppet.
He also makes an unbilled cameo appearance in the 2011 film The Muppets.
Black's film credits range from smaller parts in Waterworld, Mars Attacks!, and The Cable Guy (with Jim Carrey) to leading roles in Shallow Hal, Orange County, The School of Rock, Kung Fu Panda, Tropic Thunder (with Ben Stiller and Robert Downey, Jr.), Nacho Libre, Danny Roane: First Time Director, and Peter Jackson's remake of King Kong (as impresario Carl Denham).
He is married to Tanya Haden, an additional puppeteer for The Muppets.