Question: who does the voice of horton in horton hears a who
Answer: Directed by Jimmy Hayward and Steve Martino in in their directorial debuts , the film 's screenplay was written by Cinco Paul and Ken Daurio , and features the voices of Jim Carrey and Steve Carell as Horton the Elephant and the Mayor of Whoville , respectively , alongside Will Arnett , Seth Rogen , Isla Fisher , and Amy Poehler .