He made his debut during the 2013–14 NHL season, and wears uniform number 74.

Knorr made his NHL debut on November 13, 2013, officiating a match-up at the Xcel Energy Center between the Toronto Maple Leafs and Minnesota Wild.

[4] He has also worked as a linesman in the 2013-14 NHL season, debuting as such on February 26, 2014 at the Pepsi Center when the Colorado Avalanche took on the Los Angeles Kings; through March 11 he has worked five NHL matches as a linesman.

Knorr played three seasons as a defenceman for the Victoria Cougars of the Vancouver Island Junior Hockey League.

This Canadian biographical article relating to ice hockey is a stub.