here is a rating of the coaches who coached Detroit Lions as a Head coach
1st link = http://www.mlive.com/lions/index.ssf/2017/07/lions_head_coaches_since_1957.html#incart_m-rpt-2

look at the coaches who have coached as a assistant with Detroit Lions
2nd link = http://www.mlive.com/lions/index.ssf/2017/06/bill_belichick_don_shula_among.html