SARASOTA, Fla. -- Bud Carson, the architect of Pittsburgh's "Steel Curtain" defense who later coached the Cleveland Browns, died Wednesday. He was 75.

Carson, who had been ill with emphysema, died at his home, according to his wife's employer, TV station WWSB.

Carson was the Steelers' defensive coordinator from 1972-77, and shaped a defense led by Joe Greene, Jack Ham and Jack Lambert into one of the best in NFL history. During that time, the Steelers won three Super Bowl titles under coach Chuck Noll.

Carson then became defensive coordinator of the Los Angeles Rams, who lost to the Steelers in the Super Bowl after the 1979 season. He coached the Browns in 1989-90, posting a 11-13-1 record in 1 seasons.

Cleveland won the AFC Central in his first season, beating Buffalo 34-30 in the playoffs before losing to Denver 37-31 in the AFC championship game. He was fired the next year when the team got off to a 2-7 start.

Carson also coached Georgia Tech from 1967-71, posting a 27-27 record, including a win in the 1970 Sun Bowl.

He was a defensive back at North Carolina from 1949-51 before spending two years in the Marines.