The award, presented by NHL Central Scouting in honor of the late McGuire, is given to the candidate who best exemplifies the commitment to excellence through strength of character, competitiveness and athleticism.
"Never would have expected an award of that magnitude," Leason said. "Kind of makes sense, my story, everything that's happened over the years, commitment to the game, dedication to improve. It's very special to receive that honor."
Leason, who went undrafted in the 2017 NHL Draft and 2018 NHL Draft, was selected in the second round (No. 56) by the Washington Capitals in the 2019 NHL Draft.
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"It's a special night. Any time you get drafted its really special. I have to cherish it," Leason said. "The third time through I was looking forward, hoping my name would be picked and it has.
"It feels great. One of those days you come, you want to get drafted, just keep waiting and waiting and getting picked by the Capitals means a lot."
McGuire was director of NHL Central Scouting for seven years before dying of cancer in April 2011. A coach at the collegiate, junior and American Hockey League levels, an assistant for three NHL teams during 12 seasons and a scout for two teams, McGuire began serving as director of Central Scouting in 2005.
"This award encompasses the best traits of our game and the recipient this year portrays these core attributes having displayed the type of dedication, motivation and passion that is required to improve both on and off the ice in pursuing the goal of playing in the National Hockey League," Director of NHL Central Scouting Dan Marr said.
"In Brett Leason, you have a player who has persevered through going undrafted, being traded, playing through injury, yet all the while continuing to apply himself to improve and be the best he could be which resulted in a spot on Canada's World Junior Championship team, a WHL championship with the Prince Albert Raiders and positioning himself to be selected in the 2019 NHL Draft."
In addition to receiving the award, Leason will receive a copy of EA Sports NHL 20 when the game becomes available on Sept. 13.
After going undrafted last year, the 20-year-old worked a landscaping job but disliked it and quickly returned to the ice to get back to work.