Named a Walter Camp First-team Small College All-American, he was voted a Second-team Little All-America selection by both the Associated Press and The Sports Network.

Biermann became Montana's first-ever recipient of the Buck Buchanan Award in 2007, as well, given annually by The Sports Network to the top defensive player in Division I Football Championship Subdivision.

[citation needed] Biermann[2] was a top performer in the vertical jump and in the 3-cone drill at the 2008 NFL Combine.

He took the starting left defensive end spot from 2007 first round pick Jamaal Anderson after his performance vs San Francisco.

[citation needed] Biermann scored his first NFL touchdown on November 2, 2009 in a Monday night game at the New Orleans Saints.

On December 27, 2009, Biermann stepped in as the team's placekicker after an injury to the punter Michael Koenen during a game against the Buffalo Bills.

On October 10, 2010, he made headlines as he tipped a Jake Delhomme pass to himself for an interception and returned it 41 yards for a touchdown.

[13] In May 2010, Biermann participated in a Dancing Stars Of Atlanta charity event, at which he met Kim Zolciak, to raise money for Alzheimer's disease.

[20] In March 2013, Biermann filed to legally adopt Zolciak's daughters, Brielle and Ariana, from her previous relationships.

[23] In May 2023, Biermann filed for divorce from Zolciak after eleven years of marriage, citing their date of separation as April 30.