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When Mitch was 7 years old he started playing for the Ontario Minor Hockey Association's Clarington Toros
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In 2013 Mitch started playing for the London Knights
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In 2014 Mitch helped Team Canada win gold at the U-18 Junior World Cup tournament
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Mitch was selected fourth overall by the Maple Leafs in the 2015 NHL Entry Draft. He made his NHL debut October 12 2016
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After a long off-season Mitch finally signed a 6 year, $65.358 contract with the Toronto Maple Leafs, and was named alternate captain at the start of the 2019-2020 season.