Zero Effect is a 1998 American mystery comedy film written and directed by Jake Kasdan in his feature directional debut. Starring Bill Pullman as "the world's most private detective", Daryl Zero, and Ben Stiller as his assistant Steve Arlo, the film's plot is loosely based on the Arthur Conan Doyle short story "A Scandal in Bohemia".

Jacob Kasdan is an American filmmaker and actor. He is best known for directing Walk Hard (2007), Bad Teacher (2011), Sex Tape (2014), Jumanji: Welcome to the Jungle (2017) and Jumanji: The Next Level (2019).