Gregg Williams - Current defensive coordinator of the New Orleans Saints and the former head coach of the Buffalo Bills - Considered one of the most respected defensive minds in the game. However, Williams has a 17-31 record as a head coach in the NFL.
FILE - New Orleans Saints defensive coordinator Gregg Williams address the media after practice at the club's training facility in Metairie, La., on Thursday, Jan. 21, 2010. The Saints host the Minnesota Vikings in the NFL NFC championship football game on Sunday, Jan. 24. (AP Photo/Bill Haber)