Emmy-nominated actor Malcolm Jamal Warner rose to stardom as Theo, eldest son of the Huxtable clan on “The Cosby Show” (NBC, 1984-1992). Although none of his subsequent acting efforts scaled the pop culture heights like that series, he kept busy in the decades after its departure from the airwaves, both as a star and supporting actor on television series and the occasional film, as well as a director and jazz musician.Born Aug. 18, 1970, Warner – who was occasionally billed as Malcolm-Jamal Warner and named after Malcolm X and jazz pianist Ahmad Jamal – was raised primarily by his mother, Pam