Hart wrote the screenplay to the Steven Spielberg feature film Hook which functioned as a sequel to J. M. Barrie's original story, with Peter Pan having grown into adulthood.

He wrote the Francis Ford Coppola-produced horror films Bram Stoker's Dracula (1992)[2] and Mary Shelley's Frankenstein (1994).

Hart's writing focuses on adventure and fantasy fare, such as Muppet Treasure Island (1996), Lara Croft: Tomb Raider – The Cradle of Life (2003), and Epic (2013).

[4] Hart wrote the first draft screenplay of Atlas Shrugged,[5] which was to be fully developed by director Randall Wallace.

In 2012, it was announced that TNT would create a television series based on the Dean Koontz's Frankenstein novels.