Who is the  best head coaches in NFL history?

Would your answer be Vince Lombardi, who guided the Green Bay Packers to three NFL Championships and two Super Bowl wins?

Would your answer be Chuck Noll, who was the architect of four Super Bowl titles, with the Pittsburgh Steelers?

Would you prefer Tom Landry, or Bill Walsh, or maybe Bill Belichick?

Former Pittsburgh Steelers coach Chuck Noll

Vincent Frank, of bleacherreport.com, ranks his best 50 NFL head coaches of all-time.