Jack Foley
Keion Williams
Who?
Jack Donovan Foley was the developer of many sound effect techniques used in filmmaking. He is credited with inventing the process of adding sound effects, such as footsteps to films.
Career
He added sound effects to movies
How?
He just recorded over the film using different tools and sounds.
Change?
He changed it by making movies by making the actions seem like you are there while they were fighting, things were breaking, etc.