High Quality Content by WIKIPEDIA articles! Trey Callaway is a film and television writer and producer, best known for writing the screenplay for the movie I Still Know What You Did Last Summer. He co-created and executive produced the science fiction television series Mercy Point on the UPN network. Trey performed as an actor in the series and among other roles, also had an uncredited role in The Outsiders. In addition to penning several original pilots for American TV networks including CBS, ABC, WB, CW, Sci Fi, and The Disney Channel, he has also written and/or produced for hit shows like Supernatural and CSI: NY. Callaway is also a Professor in the USC School of Cinematic Arts at the University of Southern California.