Declan was best known for directing three films in the Wrong Turn series (2009-2012).
Declan O'Brien was the president of Fairport Filmworks.
Declan O'Brien also directed the 2010 horror film Sharktopus by Roger Corman.
Declan also wrote the movie The Snake King for Syfy.
Declan O'Brien died on February 16, 2022, at the age of 56.
He has three children named Alec O'Brien, Aidan O'Brien, and Caitlin O'Brien.