Adam Nathaniel Yauch (pronounced /jaʊk/; August 5, 1964 – May 4, 2012), better known under the stage name MCA, was an American rapper, bass player, filmmaker and a founding member of the hip hop group Beastie Boys.
Yauch founded Oscilloscope Laboratories, an independent film production and distribution company based in New York City. As a Buddhist, he was involved in the Tibetan independence movement and organized the Tibetan Freedom Concert. He died in 2012 from parotid cancer.