A celebrated, stage-trained player, Derek Jacobi (pronounced JACK-uh-bee) has made occasional forays in film and television, generally in prestigious projects.The light-haired, blue-eyed actor was born and raised in East London. His mother, who harbored theatrical ambitions of her own, encouraged her son's early interest in the theater. By age six, Jacobi began appearing in local library productions. A childhood bout with rheumatic fever temporarily paralyzed him, but his desire to act continued. While attending Cambridge, he joined amateur theatrical clubs and began appearing in productions,