Most successful NFL coaches have seasonal records that look like the classic bell curve: rising winning percentages peaking at the height of their careers and then descending over the final years of coaching.
There are, of course, a few exceptions – and they tend to be at the top of the list of all-time winningest head coaches list.
A few of the great ones, as shown in the list below never experienced a major end-of-career slump. Andy Reid is actually getting better – from 1999 through 2012 with the Eagles, he was 130-93 (.583), but with the Chiefs over the last four years he’s at 38-19 (.