Jacob Daniel Tierney was born in Montreal on September 26, 1979, the son of teacher Terry (née Smiley) and film producer Kevin Tierney (1950–2018). He is of Irish and Jewish descent. His younger sister, Brigid, is an actress.
Tierney started his career as a child actor, beginning at age six. Aside from acting, Tierney also writes and directs. He made his directorial debut in 2002 with his short film titled Dad.
Since Dad, Tierney has written and directed the feature films Twist (2003), for which he was nominated for a Genie Award for Best Adapted Screenplay, The Trotsky (2009), which garnered him two Canadian Comedy Awards and a Genie Award, Good Neighbours (2010), and Preggoland (2014). He has also directed episodes of the television sitcom Mr. D and Gavin Crawford's comedy special Gavin Crawford's Wild West. In 2012, Tierney participated in the jury of the Air Canada enRoute Film Festival.

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