Timothy William "T.W." Walsh (born January 26, 1975 in Melrose, Massachusetts) is an indie rock singer, songwriter, and producer. He has learned to play guitar, bass, keyboards, and drums. In August 2003, Walsh joined Pedro the Lion, led by David Bazan. The two would also collaborate on Bazan's Headphones project. Walsh was, aside from Bazan, the only other official member of Pedro the Lion, and was heavily involved in the recording of Pedro the Lion's Achilles Heel.