Levin, the transfer from Loyola-Marymount, averaged 11 points and seven rebounds per game last season.
Though Levin has to sit out in 2014-15, he attracted significant interest on the transfer market.
He praised Northwestern, already, for its coaching staff.
"I've just been talking to [Collins] a lot," Levin said. "He has great assistants who know what they're doing. They have NBA experience and they're down to earth guys. It's been fun to get to know them."
Levin also finds it appealing to play close to home. The River Forest (Ill.) St. Thomas More power forward said it was one of the qualities that stood out.
He also praised Marquette, Notre Dame and Georgia Tech, while planning to the other schools. Northwestern is the second stop after Marquette and new coach Steve Wojciechowski.
As for the criteria behind choosing these schools? He likes the programs, obviously, as well as the academics and connections to alumni.
This would be an immensely helpful pickup for Northwestern, which wants to add bodies and compete in the Big Ten.