William H. Wisher Jr., also known as Bill Wisher, is an American screenwriter. He is best known for his work with long-time friends Randall Frakes and James Cameron on The Terminator and Judgment Day. In the first Terminator film, William has a brief role as a police cadet who has his head smashed into his own police car by the Terminator himself, who then steals his vehicle and assumes his identity.
His other work includes Judge Dredd, The 13th Warrior and both versions of The Exorcist prequel. He is an uncredited script doctor on two films in the Die Hard series, 1995's Die Hard With A Vengeance and 2007's Live Free Or Die Hard (on which he also served as executive producer). He is one of a handful of writers to have contributed to multiple films in three separate movie franchises. Wisher participates in World War II reenacting with the Southern-California-based California Historical Group.