Best known as a writer, director, and co-executive producer on Buffy the Vampire Slayer.
He has also written for the television shows Angel, The 4400, Tru Calling and American Horror Story: Coven.
[1] He made a cameo on Joss Whedon's web-based film, Dr. Horrible's Sing-Along Blog, as "Professor Normal".
[2] In April 2016 Petrie and Ramirez were announced as showrunners of The Defenders, a miniseries that crosses over Daredevil, Jessica Jones, Luke Cage, and Iron Fist.
Petrie joined the Buffy writing staff in season three as a story editor.