He both played coached at Michigan under the legendary Bo Schembechler. After a 20-year college career (the last nine as DC), he was hired by the Jets' Eric Mangini to handle the linebackers. When Mangini was booted by the Jets in 2008, Herrmann was hired by Tom Coughlin and the Giants.
From Rueben Frank of CSNPhilly:
Although the Eagles aren’t commenting on any reports about coaches interviewing for jobs under new head coach Chip Kelly, Herrmann is the third known candidate to replace Todd Bowles as defensive coordinator.
Georgia defensive coordinator Todd Grantham and Alabama defensive coordinator Kirby Smart are also up for the defensive coordinator job.
Whoever the Eagles hire will become their fifth defensive coordinator in the last seven years. Sean McDermott took over in 2009 after the tragic death of legendary Jim Johnson but was fired after two years. Juan Castillo replaced McDermott but only lasted until midway through 2012 before being replaced by Bowles. McDermott is now the Panthers' defensive coordinator under Ron Rivera, and Castillo is a candidate to join Rivera’s staff as offensive line coach.