A biography that appears on a Blogspot post: "Marvin X is a poet, playwright, essayist, organizer, one of the founders of the Black Arts Movement. He attended Oakland's Merritt College along with Huey Newton and Bobby Seale. He introduced Eldridge Cleaver to the Black Panthers. He was a member of the Negro Student Association/Black Student Union at San Francisco State University, 1964. Marvin co-founded Black Arts West Theatre, San Francisco, 1966, Black House, San Francisco, 1967, and was a member of Harlem's New Lafayette Theatre, 1968. He taught at Fresno State University, UC Berkeley, UC San Diego, San Francisco State University, Mills College, Laney and Merritt Colleges, Oakland; University of Nevada, Reno. He lectures at colleges and universities coast to coast. Marvin is prolific: he's written 30 books. His current project is the Black Arts Movement Business District, downtown Oakland. He is in the Black Panther film Vanguard of the Revolution directed by Stanley Nelson. See his memoir of Eldridge Cleaver: My friend the Devil, Black Bird Press, 2009, Berkeley CA".
Wikipedia biography of Marvin X https://en.wikipedia.org/wiki/Marvin_X