Montgomery joins New England after spending the last nine seasons with the Green Bay Packers (2015-23), including the last two seasons as the defensive line/running game coordinator (2022-23). Prior to that position, he spent four seasons (2018-21) as the defensive line coach and three seasons (2015-17) as the defensive front assistant. Montgomery joined the Packers after coaching at the collegiate level for 11 seasons and high school level for two seasons. He began his coaching career as a student assistant at Iowa in 2002. Montgomery continued coaching as an assistant at Iowa City West High School (2000-04) and as the defensive coordinator at North Iowa Community College (2005). He spent three seasons at Northern Iowa (2006-08), followed by two seasons each at Wyoming (2009-10), Michigan (2011-12) and Oklahoma (2013-14), before joining the Green Bay Packers. Montgomery played defensive tackle at Iowa (1998-2001), starting three of his four years in college. He went to training camp with the New Orleans Saints in 2002 and played in the Arena Football League with the Chicago Rush, Colorado Crush and Las Vegas Gladiators from 2003 through 2005.
