I looked and didn't see a thread containing this information.

Now, we already knew about Cox, but this article has a little more info.

First-year Jets coach Eric Mangini has added two more assistants to his defensive staff, hiring former NFL linebacker Bryan Cox and University of Michigan defensive coordinator Jim Herrmann.

Cox and Herrmann are expected to begin work Monday under the stewardship of Jets defensive coordinator Bob Sutton. Cox, 37, will serve as a defensive line assistant, while the 45-year-old Herrmann will coach the linebackers.

The Jets have only sporadically released the names of the coaches recently hired and it is believed that Mangini, the former New England Patriots' defensive coordinator who supplanted Herman Edwards as head coach, will confirm the additions of his assistants when the staff is complete.

Cox began working under Denny Marcin, who was retained from Edwards' staff. Cox primarily played linebacker for 12 years in the league, and with five different franchises, but his familiarity with the 3-4 front could be of considerable help if the Jets switch to that defense under Mangini.

The hiring of the fiery Cox had been rumored for several weeks. As a standout linebacker in the league, he played with Miami (1991-95), Chicago (1996-97), the Jets (1998-2000), New England (2001) and New Orleans (2002). Toward the end of his playing career, Cox made it clear that he hoped to move into coaching someday.

Herrmann coached at Michigan for 20 years and was the Wolverines' defensive coordinator for the past nine seasons. In 1997, he won the Frank Broyles Award as the country's top assistant coach. He was a three-year letterman for the Wolverines in the early '80s.
http://sports.espn.go.com/nfl/news/story?id=2328377