L.C. Greenwood, a three-year defensive line star and 1968 Ebony All-America at Arkansas AM&N, joined the Pittsburgh Steelers as a 10th-round draft choice and the 238th player selected in the 1969 NFL Draft. The 6-6, 245-pound Greenwood served as a fifth defensive lineman his first two seasons before becoming firmly entrenched as the Steelers' regular defensive left end in 1971. That year he led the team in sacks (8.5) and shared the NFL lead in fumble recoveries (5). For the next 11 seasons, Greenwood teamed with Joe Greene at left tackle to provide the Steelers' famed "Steel Curtain" defensive unit with awesome strength on the left side of the front line. The "Steel Curtain" formed the heart of a legendary defense that led Pittsburgh to four Super Bowl victories and seven division titles.
Greenwood, who was born September 8, 1946, in Canton, Mississippi, became widely respected for his consistency and his knack of avoiding major career-threatening injuries. A knee injury did cause him to miss five games in 1977 but Greenwood rebounded with one of his finest seasons in 1978. He possessed exceptional quickness and speed and he used his height to bat down passes or forced opposition passers to rush their throws. Noted for his reckless, freewheeling style as a pass rusher, Greenwood amassed 73.5 sacks (unofficial) in 13 seasons. Six times he led his team in that defensive category. He also recorded 14 career opponents' fumble recoveries.
Greenwood was the Steelers' starting defensive left end in six AFC championship games and Super Bowls IX, X, XIII, and XIV. In Super Bowl IX, he played a major role in Pittsburgh's 16-6 victory over Minnesota by batting down three of Fran Tarkenton's passes. In Pittsburgh's Super Bowl X win over the Dallas Cowboys the next year, Greenwood sacked Roger Staubach three times. In 1991, he was named to the Super Bowl Silver Anniversary Team. Greenwood was named All-Pro in 1974 and 1975 and All-AFC five times and appeared in six Pro Bowls in a seven-year stretch from 1973-1979.