Former NFL head coach and defensive coordinator Buddy Ryan, who was responsible for some of the greatest defenses to ever play the game, has died at the age of 82.

Ryan coached two defenses that won Super Bowl titles and was head coach of the Philadelphia Eagles from 1986-1990 and for the Arizona Cardinals from 1994-1995. His blitz-focused defensive scheme for the Jets helped them earn their only Super Bowl championship in 1969. His vaunted “46 defense” for the 1985 Chicago Bears is considered to be one of the NFL's greatest defenses.

Known for his feisty, outspoken and sometimes physically aggressive sideline behavior, Ryan nevertheless earned a fierce loyalty and respect among his players. He did have a distinct bias for defensive players, however, making it clear that he thought quarterbacks were overpaid and overrated.

He also didn't think much of kickers. The NFL posted some of Ryan's most famous quotes, which included such gems as, "Football kickers are like taxi cabs. You can always go out and hire another one."

Ryan’s twin sons, Rex and Rob, also became NFL coaches.

In later years, Ryan had suffered a stroke and battled cancer. He had been confined to a wheelchair.

Tributes from players and fans poured in for Ryan via social media.