Novels:
* The Perks of Being a Wallflower (1999)
* Manners of the Dead (2003)
* Imaginary Friend (2017)
Screenplays:
* The Perks of Being a Wallflower (2012) - based on his novel
* Rent (2005) - based on the musical
* The Village (2004) - co-written with M. Night Shyamalan
Other:
* The Adventures of Captain Underpants (2011) - co-writer of the graphic novel adaptation
He also contributed to the "Chicken Soup for the Soul" series.