Jacob Tierney is the co-creator of Letterkenny. He has directed every episode and has, with fellow executive producer Jared Keeso, written almost every episode. He also plays the recurring character Glen.
Tierney began his entertainment career at the age of six, appearing in Ford: The Man and the Machine. In the early 1990s played Max Townsend in Dracula: The Series, Greg in Watatatow, and Eric in Are You Afraid of the Dark? He starred in Josh and S.A.M. in 1993, and won a YTV Achievement Award for Acting the same year.
He made his directorial debut with the short film Dad in 2002, and write and directed his first feature-length film, Twist, the following year, which was nominated for four Genie awards. He wrote and directed 2009's The Trotsky, which won him two Canadian Comedy Awards and a Genie.
Tierney is the son of noted producer Kevin Tierney (Bon Cop, Good Cop) and Brigid Tierney, a teacher. His younger sister Brigid Tierney also works as an actress.