Cormac and Marianne Wibberley

Cormac Wibberley and Marianne Wibberley (also known as The Wibberleys) are an American husband and wife screenwriting team. They have been writing together since 1991, and made their first screenplay sale in 1993. 
Cormac's father was Leonard Wibberley, creator of the fictional Duchy of Grand Fenwick, and author of "The Mouse That Roared", among other books.
Biography.
The pair grew up in Southern California, where they attended Mira Costa High School. Both went on to attend UCLA as undergraduates, with Marianne staying at UCLA for graduate work at the film school. They currently live in the South Bay, Los Angeles area with their daughter.
They have been credited writers on films including "National Treasure", "I Spy", "The 6th Day" and "".
They have taught screenwriting at UCLA.