Rath was born in Montreal, Quebec, Canada. His mother is of Goan Indian descent, whereas his father is of English and Austrian-Jewish heritage.12 His older sister is actress Meaghan Rath.
Rath's first role was in 2005, as a runner in the sports film The Greatest Game Ever Played, and he later joined a low-budget film, Prom Wars: Love Is a Battlefield, followed by The Trotsky. He got his biggest break on television in 2009 after getting cast in the miniseries Assassin's Creed: Lineage, playing Federico Auditore, the role of one of the sons of the lead character, Giovanni.3 The same year, he was cast in a recurring role in the Disney XD show Aaron Stone. He was then cast as one of the main leads in the CBC show 18 to Life.4 He starred in a direct-to-video film, The Howling: Reborn.5 He later joined another Canadian series, Mudpit. He also guest-starred on Being Human, playing the role of the younger brother of the female lead, portrayed by Meaghan Rath. In mid-2012, he was cast in the science fiction television series Defiance.6
He was co-nominated for two Gemini Awards in 2010 and 2011, for Best Ensemble Performance in a Comedy Program or Series, for 18 to Life. From 2018 to 2021, Rath portrayed Brainiac 5 in Supergirl.7
"Personality Complex: "Being Human" Star Meaghan Rath Loves How You're Underestimating HerOn How Sally is a Lot Like Meaghan". http://ca.complex.com/pop-culture/2014/01/meaghan-rath-being-human-interview/meaghan-rath-being-human-character-reflects-her ↩
"On the scene of the crime — and comedy, romance and sci-fi". February 5, 2015. https://montrealgazette.com/entertainment/local-arts/on-the-scene-of-the-crime-and-comedy-romance-and-sci-fi ↩
Terrace, Vincent (November 11, 2014). Internet Drama and Mystery Television Series, 1996-2014. McFarland Publishing. p. 12. ISBN 9780786495818. 9780786495818 ↩
"CW to premiere new Canadian comedy series 18 to Life this summer". Hollywoodnews.com. July 15, 2010. Archived from the original on February 22, 2014. Retrieved September 9, 2013. https://web.archive.org/web/20140222001758/http://www.hollywoodnews.com/2010/07/15/cw-to-premiere-new-canadian-comedy-series-18-to-life-this-summer/ ↩
Miller, Jesse (October 7, 2011). "The Howling: Reborn (2011) Review". MoreHorror.com. Archived from the original on November 22, 2016. Retrieved September 9, 2013. https://web.archive.org/web/20161122222931/http://www.morehorror.com/The-Howling-Reborn-2011-Review ↩
Kondolojy, Amanda. "Syfy's Highly-Anticipated Defiance Commences Production In Toronto". zap2it.com. Archived from the original on April 28, 2012. Retrieved September 9, 2013. https://web.archive.org/web/20120428004230/http://tvbythenumbers.zap2it.com/2012/04/25/syfys-highly-anticipated-defiance-commences-production-in-toronto/130848/ ↩
Petski, Denise (June 15, 2018). "Supergirl: Jesse Rath Upped To Series Regular For Season 4". Deadline. Retrieved December 3, 2024. https://deadline.com/2018/06/supergirl-jesse-rath-promoted-series-regular-season-4-the-cw-1202411077/ ↩
Parker, Luke (December 29, 2019). "Jay and Silent Bob Reboot: Every Single Cameo". ScreenRant. Retrieved December 3, 2024. https://screenrant.com/jay-silent-bob-reboot-movie-cameos/ ↩
Andreeva, Nellie (May 12, 2016). "Riverdale, Frequency & No Tomorrow Picked Up To Series By The CW". Deadline. Retrieved December 3, 2024. https://deadline.com/2016/05/riverdale-frequency-no-tomorrow-picked-up-to-series-by-the-cw-1201754618/ ↩