The Lawnmower Man IMDB
The film is named after a Stephen King short story of the same title, but aside from a single scene, the stories are unrelated. The film stars Jeff Fahey as Jobe Smith, a simple-minded gardener, and Pierce Brosnan as Dr. Lawrence Angelo, the scientist who decides to experiment on him.
An earlier short film, also titled "The Lawnmower Man", is a more faithful adaptation of the short story. It was directed by Jim Gonis in 1987.
Directed by: Brett Leonard
Screenplay by: Brett Leonard, Gimel Everett
Starring: Jeff Fahey, Pierce Brosnan, Jenny Wright, Geoffrey Lewis, Jeremy Slate, Dean Norris, Austin O'Brien