William Lyman (born May 20, 1948) is an American actor, perhaps best known for his role as William Tell in the 1987 television series Crossbow and as the polished, resonant voice that has narrated the PBS series Frontline since its second season in 1984. Lyman has made a successful career in television and theater. In addition, he made a movie appearance in Hostile Takeover and, with his distinctive, commanding cadences, narrated the 2006 film Little Children as well as various other films. He appeared on the shows Commander in Chief, Threat Matrix, The West Wing, and Law & Order.