Lou Costello was an American comedian and actor, best known for his work in the comedy duo Abbott and Costello alongside Bud Abbott. Born on March 6, 1906, in Paterson, New Jersey, he gained fame in the 1940s for his unique style of humor, characterized by his quick wit and playful banter. Costello starred in numerous films and television shows, with one of his most famous routines being "Who's on First?" This classic comedy sketch showcased his talent for wordplay and timing. He continued to entertain audiences until his death on March 3, 1959.