From Wikipedia, the free encyclopedia Gattlin Tadd Griffith (born November 13, 1998) is an American child actor, best known for portraying Walter Collins in the 2008 film Changeling. He also had episodic roles on TV series such as Supernatural. Griffith was born to Tad and Wendy Griffith. He has three younger brothers, Callder (born June 30), Arrden and Garrison. Description above from the Wikipedia article Gattlin Griffith, licensed under CC-BY-SA, full list of contributors on Wikipedia.