- Birth nameJean-Guy Kastner
- John Kastner is known for Firewall (2006), She's Out of My League (2010) and Suck (2009). He was previously married to Nicole de Boer.
- SpouseNicole de Boer(December 18, 1999 - 2012) (divorced, 1 child)
- Ex-Husband of Nicole de Boer.
- Father, with Nicole de Boer, of daughter Summer Lee Kastner, born in January 2007.
- Became a father for the second time at age 45 when his girlfriend Jessica Paré gave birth to their son Blues Anthony Paré Kaster on 19 March 2015.
- Singer for Montreal hardcore punk band, The Asexuals, singer/guitarist for Montreal alternative band, Doughboys, and alternative band, 'All Systems Go!', guitarist for band Bran Van 3000.
- Ex-brother-in-law of Ryan DeBoer.
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