Mason has led one of the country's best defenses the last few years. The new coach replaces James Franklin, who took the Penn State job last week.
Vandy's search is led by Parker Executive out of Atlanta. Clemson offensive coordinator Chad Morris also is considered a candidate for the job.
Mason, a Broyles Award finalist, led the nation's third-ranked rushing defense. He was a Minnesota Vikings assistant before joining Stanford in 2010.
Montgomery spent three seasons as the Steelers wide receivers coach before joining David Cutcliffe's staff last year.
Playcalling will be a collaborative effort with Cutcliffe and Montgomery.
Pruitt transitioned well from Alabama defensive backs coach to Jimbo Fisher's coordinator, helping lead the Seminoles' speedy defense to a national title.
If Georgia linebackers coach Kirk Olivadotti doesnt' get promoted to coordinator, he could leave for the NFL.