After playing defensive tackle at North Texas State College, Greene was the surprise first-round draft choice of the NFL's Pittsburgh Steelers in 1969. He soon became the leader of the "Steel Curtain" defensive unit that helped the Steelers win four Super Bowls.
The 6-foot-4, 260-pound Greene was extremely fast off the ball, so much so that opponents sometimes accused him of being offside when he wasn't. He pioneered the technique of lining up at an angle, with one shoulder pointing at the gap between two offensive linemen, rather than being square to the line of scrimmage.
The NFL's defensive rookie of the year in 1969, Greene was named an All-Pro eight consecutive years, from 1970 through 1977, and he was voted defensive player of the year in 1972 and 1974. Greene retired after the 1981 season and later became Pittsburgh's defensive line coach. He has since worked for the Steelers in various capacities. He is a member of the Pro Football Hall of Fame.
