The Great Liberacho is Birdie McClaine, a professional clown formerly with Ringling bros. Barnum and Bailey Circus who is now traveling the world with his one clown, one dog, and one dummy show delighting audiences. He sometimes performs with his dog Ruby The Mind Reading Gypsy Dog and ventriloquist puppet Sammy. 
The Great Liberacho's audition in Episode 1204 consisted of playing on the piano. Howie Mandel, Mel B, Heidi Klum, and Simon Cowell all buzzed the act. All four judges voted "No", eliminating the act from the competition.