Conversation so far:
When was Krusty the Clown created?
Krusty first appeared in The Krusty the Clown Show, one of The Simpsons shorts from The Tracey Ullman Show that first aired on January 15, 1989
What did Krusty do in the The Krusty the Clown Show episode?

Question: Who voiced him?
Self-contained rewrite: Who voiced Krusty the clown?