Young Conan(01 of32)
Open Image ModalTHR initially posted this mysterious photo of young Conan, evidently during his Hawaiian/Roman period.
Young "Simpsons" Writer(02 of32)
Open Image Modal (credit:Wikimedia / Bill Oakley)
The Audition(03 of32)
Open Image ModalConan O'Brien interviews Jason Alexander for his "Late Night" audition in 1993 on the set of Jay Leno's "Tonight Show."
Late Night with Conan O'Brien(04 of32)
Open Image ModalConan was full of nerves his first few years on "Late Night," but eventually won audiences and critics over. (credit:Getty Images)
Late Night with Conan O'Brien(05 of32)
Open Image ModalYoung Jon Stewart appears on Conan's show in the early '90s (hence the regrettable denim). (credit:Getty Images)
Debut Letterman Appearance (06 of32)
Open Image ModalConan first appeared on "Late Show With David Letterman" on July 29th, 1994. (credit:<a href="http://www.youtube.com/watch?v=Ru9WoC1LtR8" target="_blank" role="link" class=" js-entry-link cet-external-link" data-vars-item-name="YouTube" data-vars-item-type="text" data-vars-unit-name="55b7ae8de4b0224d8833fdf4" data-vars-unit-type="buzz_body" data-vars-target-content-id="http://www.youtube.com/watch?v=Ru9WoC1LtR8" data-vars-target-content-type="url" data-vars-type="web_external_link" data-vars-subunit-name="before_you_go_slideshow" data-vars-subunit-type="component" data-vars-position-in-subunit="6" data-vars-position-in-unit="13">YouTube</a>)
1995 White House Correspondents Dinner(07 of32)
Open Image ModalConan hosted the White House Correspondents Dinner for the first time in 1995 and he will do so again in 2013. (credit:<a href="http://www.youtube.com/watch?v=9bneq9XgF9M" target="_blank" role="link" class=" js-entry-link cet-external-link" data-vars-item-name="YouTube" data-vars-item-type="text" data-vars-unit-name="55b7ae8de4b0224d8833fdf4" data-vars-unit-type="buzz_body" data-vars-target-content-id="http://www.youtube.com/watch?v=9bneq9XgF9M" data-vars-target-content-type="url" data-vars-type="web_external_link" data-vars-subunit-name="before_you_go_slideshow" data-vars-subunit-type="component" data-vars-position-in-subunit="5" data-vars-position-in-unit="12">YouTube</a>)
Late Night with Conan O'Brien(08 of32)
Open Image ModalConan interviews Martha Stewart on "Late Night." (credit:Getty Images)
Late Night with Conan O'Brien(09 of32)
Open Image ModalConan interviews Peter Gallagher. (credit:Getty Images)
Late Night with Conan O'Brien(10 of32)
Open Image ModalConan and sidekick Andy Richter have some WASPy cheer. (credit:Getty Images)
Late Night with Conan O'Brien(11 of32)
Open Image ModalConan used to have Tony Bennett on his Christmas show every year. (credit:Getty Images)
Late Night with Conan O'Brien(12 of32)
Open Image ModalConan interviews Ellen DeGeneres in 1996. (credit:Getty Images)
Late Night with Conan O'Brien - Season 5(13 of32)
Open Image ModalBy its 5th year, "Late Night with Conan O'Brien" had really hit its stride. (credit:Getty Images)
Late Night Interview 1997(14 of32)
Open Image ModalInterviewing Fred Savage on "Late Night" in 1997.
Late Night Interview 1998(15 of32)
Open Image ModalInterviewing fellow comedian and "SNL" alum Ana Gasteyer. (credit:<a href="http://www.youtube.com/watch?v=27XlnLXiDDU" target="_blank" role="link" class=" js-entry-link cet-external-link" data-vars-item-name="YouTube" data-vars-item-type="text" data-vars-unit-name="55b7ae8de4b0224d8833fdf4" data-vars-unit-type="buzz_body" data-vars-target-content-id="http://www.youtube.com/watch?v=27XlnLXiDDU" data-vars-target-content-type="url" data-vars-type="web_external_link" data-vars-subunit-name="before_you_go_slideshow" data-vars-subunit-type="component" data-vars-position-in-subunit="4" data-vars-position-in-unit="11">YouTube</a>)
Late Night with Conan O'Brien(16 of32)
Open Image ModalJim Carrey played one of the most popular characters from "Late Night," the Masturbating Bear. (credit:Getty Images)
Late Night with Conan O'Brien(17 of32)
Open Image ModalDave Chappelle stops by "Late Night." (credit:Getty Images)
Jimmy Fallon(18 of32)
Open Image ModalJimmy Fallon's debut "Late Night" appearance on 2/18/1999. He'd go on to take over the show from Conan.
Late Night Interview 2000(19 of32)
Open Image ModalConan interviews Britney Spears at the height of her popularity. (credit:<a href="http://www.youtube.com/watch?v=9q9y_u36LnY" target="_blank" role="link" class=" js-entry-link cet-external-link" data-vars-item-name="YouTube" data-vars-item-type="text" data-vars-unit-name="55b7ae8de4b0224d8833fdf4" data-vars-unit-type="buzz_body" data-vars-target-content-id="http://www.youtube.com/watch?v=9q9y_u36LnY" data-vars-target-content-type="url" data-vars-type="web_external_link" data-vars-subunit-name="before_you_go_slideshow" data-vars-subunit-type="component" data-vars-position-in-subunit="3" data-vars-position-in-unit="10">YouTube</a>)
Late Night Interview 2001(20 of32)
Open Image ModalInterviewing Tina Fey in 2001. (credit:<a href="http://www.youtube.com/watch?v=OlvTaREVCQw" target="_blank" role="link" class=" js-entry-link cet-external-link" data-vars-item-name="YouTube" data-vars-item-type="text" data-vars-unit-name="55b7ae8de4b0224d8833fdf4" data-vars-unit-type="buzz_body" data-vars-target-content-id="http://www.youtube.com/watch?v=OlvTaREVCQw" data-vars-target-content-type="url" data-vars-type="web_external_link" data-vars-subunit-name="before_you_go_slideshow" data-vars-subunit-type="component" data-vars-position-in-subunit="2" data-vars-position-in-unit="9">YouTube</a>)
Conan O'Brian at 54th Annual Primetime Emmy Awards Inside(21 of32)
Open Image ModalConan made a splash when hosting the 2002 Emmy Awards, which he would repeat in 2003 and 2006. (credit:Getty Images)
Late Night Interview 2003(22 of32)
Open Image ModalInterviewing Christopher Walken in 2003.
Brad Pitt and Janet Jackson Visit "Late Night with Conan O' Brien"(23 of32)
Open Image ModalConan interviews Brad Pitt. (credit:Getty Images)
Conan & His Wife(24 of32)
Open Image ModalConan and his wife Liza Powel O'Brien. They have two children. (credit:Getty Images)
Late Night "Year In Review"(25 of32)
Open Image ModalTalking to "George W. Bush" in his 2005 year in review special. (credit:<a href="http://www.youtube.com/watch?v=g7zNwbR-YRk" target="_blank" role="link" class=" js-entry-link cet-external-link" data-vars-item-name="YouTube" data-vars-item-type="text" data-vars-unit-name="55b7ae8de4b0224d8833fdf4" data-vars-unit-type="buzz_body" data-vars-target-content-id="http://www.youtube.com/watch?v=g7zNwbR-YRk" data-vars-target-content-type="url" data-vars-type="web_external_link" data-vars-subunit-name="before_you_go_slideshow" data-vars-subunit-type="component" data-vars-position-in-subunit="1" data-vars-position-in-unit="8">YouTube</a>)
58th Annual Primetime Emmy Awards - Show(26 of32)
Open Image ModalHe was a big hit when he again hosted the Emmys in 2006. (credit:Getty Images)
The Tonight Show with Conan O'Brien(27 of32)
Open Image ModalLouis CK, who started his career as a staff writer on "Late Night," visits Conan on "The Tonight Show." (credit:Getty Images)
The Tonight Show with Conan O'Brien(28 of32)
Open Image ModalConan reunited with Andy Richter for "The Tonight Show." (credit:Getty Images)
Conan O'Brien Performing(29 of32)
Open Image ModalAfter leaving "The Tonight Show," Conan traveled across the country on the "Legally Prohibited From Being Funny On Television Tour." (credit:WikiMedia:)
Conan O'Brien(30 of32)
Open Image ModalConan reappeared on TBS for a new talk show, "Conan." (credit:AP)
Guitar Battle With Jack Black 2010(31 of32)
Open Image ModalConan playing guitar with Jack Black on "Conan." (credit:<a href="http://www.youtube.com/watch?v=peEEQ7T-TU8" target="_blank" role="link" class=" js-entry-link cet-external-link" data-vars-item-name="YouTube" data-vars-item-type="text" data-vars-unit-name="55b7ae8de4b0224d8833fdf4" data-vars-unit-type="buzz_body" data-vars-target-content-id="http://www.youtube.com/watch?v=peEEQ7T-TU8" data-vars-target-content-type="url" data-vars-type="web_external_link" data-vars-subunit-name="before_you_go_slideshow" data-vars-subunit-type="component" data-vars-position-in-subunit="0" data-vars-position-in-unit="7">YouTube</a>)
Christmas in Washington(32 of32)
Open Image ModalConan hosts the "Christmas in Washington" show with the First Family. (credit:AP)