Robert "Bob" Guillaume (born November 30, 1927) is an American stage and television actor, best known for his role as Benson Du Bois on the TV-series Soap and the spin-off Benson, voicing the mandrill Rafiki in The Lion King and as Isaac Jaffe on Sports Night. In a career that has spanned more than 50 years he has worked extensively on stage (including a Tony Award nomination), television (including winning two Emmy Awards), and film..