Montgomery is the offensive coordinator and quarterbacks coach at James Madison, a Football Championship Subdivision program, and helped the Dukes to the FCS playoffs this spring.
Cole has been the assistant strength and conditioning coach at Minnesota since 2017.
Seven players from UB's 2020 roster initially entered the transfer portal in the week after Lance Leipold’s departure to become the head coach at Kansas, on April 30.
Cauthen has coached at the high school, junior college and college football levels since 1990, and worked on the Valdosta State staff with new head coach Maurice Linguist in 2008.
Linguist, 37, is in his 15th season of coaching football, and UB is his first head coaching job.