John Patrick Amedori is an American actor and musician. He is best known for playing the 13 year old version of the character Evan in The Butterfly Effect. On House, he played the teenage poison victim Matt Davis in Poison. He has been an actor in movies, televisions and commercials since he was 11 years old, but still managed to graduate high school by the age of 15. He currently plays with an independent band, Ceesau.