Omar Alfredo Rodríguez-López (born September 1, 1975) is a multi-instrumentalist, songwriter, producer, writer, actor and film director who was born in Bayamón, Puerto Rico. He is best known for being the guitarist and bandleader of The Mars Volta from 2001 until their breakup in 2012, and is currently the guitarist for the alternative rock groups Antemasque and Bosnian Rainbows. He is also the former bassist and guitarist for the dub reggae band De Facto and the post-hardcore outfit At the Drive-In, respectively. He has also embarked on a solo career, both in studio and in concert, frequently described as experimental, avant-garde and/or progressive. He has collaborated with numerous artists spanning from John Frusciante to El-P.