Schornstein raced against able-bodied athletes until he was a teenager. Competing in the standing category (he has congenital paralysis of his right arm), Schornstein was a consistent top-10 IPC World Cup finisher in 2012/13, and was the men’s Canadian slalom champion in 2013 after battling back from a knee surgery that kept him from competing in the 2012-13 IPC World Cup circuit. At the age of 17, he had four top-15 finishes at the 2011 IPC world championships. In the 2015-16 season Schornstein placed seventh in the slalom race at World Cup Finals, and consistently stayed in the top 15 across all events.
Kirk performed exceptionally well in January 2017 at the 2017 IPC world championships in Tarvisio, Italy where he captured silver in the downhill. He also posted three other top-ten finishes including fourth-places in both the super-G and super combined.
He serves as a member of the Athletes' Council of the Canadian Paralympic Committee
Schornstein plays volleyball and helps out with the family mechanical contracting business in his hometown of Spruce Grove, Alta.