Kelsey Grammer
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If you mean the character's name... obviously it's Sideshow Bob since that's what everyone calls him.
sideshow Bob and Snake
As of Season 26, Sideshow Bob has appeared in (not counting the clip show, mentions or photos) 39 episodes.
His name was Cecil Terwilliger and he was played by David Hyde Pierce who also plays the role of Frasier's brother, Niles, in the TV series 'Frasier' (Frasier is played by Kelsey Grammer who voices Sideshow Bob, hence the title of the episode 'Brother From Another Series'). He is another criminal that made a crime using a weak dam to kill his brother Side show Bob, Bart and Lisa. He was tring to kill Bob because he wanted to be Krusty's sidekick, but Bob got the audition.
Armed Robbery of the Quik-E-Mart