Quillan was never drafted but has progressed well in the NCAA over the past couple of seasons. As a result, he garnered lots of interest from NHL scouting teams. It seems that the Toronto Maple Leafs won out in this case though as per Elliotte Friedman.
He also won a national championship last year when Quinnipiac defeated Minnesota in the frozen four championship game. That season he has 19 goals and 38 points in 41 games. The 22-year-old will now look to start his professional career, likely starting with the Toronto Marlies. He joins a Leafs prospect pool that is lacking at every position so he may very well work his way up to a role with the Leafs at some point over the next few seasons.