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A 1975 Consensus All-American, Buttle was also the captain of the Nittany Lions that year. Considered by Penn State coach Joe Paterno "as fine a linebacker as any prospect produced by this school," he still holds the school records for tackles in a game (24), and season (165). He stood atop the Penn State career tackles list for over 30 years (until Paul Posluszny surpassed his mark of 343 versus Wisconsin on November 4, 2006). In 2000 Buttle was honored with the Butkus Silver Anniversary Award, which honors the top college linebacker from 25 years ago. He has been named a Penn State All-Time NFL Player.
Buttle was selected in the 3rd round (#67 overall) of the 1976 NFL Draft by the New York Jets for whom he would play 9 seasons (1976–1984) at starting outside linebacker. Two interceptions in the Jets' 1981 playoff game against Buffalo helped fuel a big comeback effort (which ultimately fell short) in the franchise's first playoff game since the 1969 season. He was a key member of defensive coordinator [[Joe Gardi]]'s Swarm defense which included fellow Nittany LionLance Mehl, as well as the famed "New York Sack Exchange" defensive line. Buttle was cut in August 1985 by Joe Walton.
Buttle serves as an on-air analyst for WCBS-TV in New York City, alongside play-by-play man Ian Eagle, for Jets preseason games, and hosts Jets Gameday on the Jets Radio Network and ESPN New York alongside Don LaGreca. He also serves as an analyst on the SportsNet New York studio show Jets Nation. He was the temporary fill-in host on WABC radio in NYC, in the 10:00 AM – noon slot, until Geraldo Rivera took the chair permanently on Jan. 3, 2012.
Buttle has received numerous honors and awards in recognition of his commitment to the community including National Spokesman for the United Way. He holds a Bachelor of Arts in general arts and sciences from Penn State University. He lives in Northport, New York with his wife, Rita, son Greg Jr. and two daughters, Christina and Allegra.
Buttle, alongside Larry Mallia, hosts an annual Labor Day Bocce Tournament at the Mallia's house in Northport, New York. This tournament was started on Labor Day in year 2000. Buttle was the champion in 2000 but has yet to reach the finals since.