Gregg Kevin Carr, M.D. (born March 31, 1962) is currently an orthopedic surgeon practicing at Southern Orthopaedic Specialists in Birmingham, Alabama and a former professional American football linebacker in the National Football League (NFL) where he played four seasons for the Pittsburgh Steelers (1985–1988).
 Carr was an All-American college football linebacker at Auburn University (1981 - 1984) and later attended the University of Alabama School of Medicine.
Allen Edward Atkinson (born July 28, 1943) is a former American football linebacker who played in the American Football League (AFL) and the National Football League (NFL).
 He played high school ball at Monsignor Bonner High School.
 He played college football at Villanova University, where he was a linebacker.
 He played professionally in the AFL for the New York Jets from 1965 through 1969; then for the NFL Jets through 1974.
 He was a member of the Jets' 1968 World Championship team, and an American Football League All-Star in 1968.
Hardy Brown (May 8, 1924 – November 8, 1991) was an American football linebacker in the National Football League (NFL), All-America Football Conference (AAFC), and the American Football League (AFL).
 He played college football at the University of Tulsa and then professionally for the San Francisco 49ers, Washington Redskins, and the Denver Broncos.
 He was one of only two men who played in the All-America Football Conference, the National Football League, and the American Football League (the other was Ben Agajanian).
Dion Lamont Foxx (born June 11, 1971 in Richmond, Virginia) is a former American football linebacker in the National Football League.
 Dion Foxx played for the Miami Dolphins, the Washington Redskins, and the Green Bay Packers.
 Foxx's playing career also included stints in the Canadian Football League, Spring Football League and XFL.
 Foxx began as a stand out player at Meadowbrook High School.
 Foxx went on to become a dominant Linebacker at James Madison University.
 In recent years, he has taught at the middle school and high school levels, and coaches high school football.
 Dion Foxx is also a member of Omega Psi Phi fraternity.
Jerome "Jerry" Brown, Jr., (October 20, 1987 – December 8, 2012) was an American football linebacker who played for five different teams combined in the National Football League, Arena Football League and Canadian Football League.
 In college, he played on the defensive line for the University of Illinois.
 In his professional career, he was a member of the Hamilton Tiger-Cats of the Canadian Football League, the Jacksonville Sharks and San Antonio Talons of the Arena Football League and the Indianapolis Colts and Dallas Cowboys of the National Football League.
 He was signed as a free agent by the Jacksonville Sharks in 2011 and was a contributor to the Sharks victory in ArenaBowl XXIV by having one tackle assist, a forced fumble and a fumble recovery.
Kenny Frank Rose (born June 9, 1962) is a former professional American football linebacker in the National Football League for the New York Jets, Cleveland Browns, and the Philadelphia Eagles.
 Rose graduated from Christian Brothers High School (Sacramento, California).
 He attended the University of Nevada, Las Vegas and played alongside Randall Cunningham, among others.
 Undrafted by the National Football League, Ken caught on with the Saskatchewan Roughriders of the Canadian Football League.
 Following two seasons there, he played a season with the Tampa Bay Bandits of the United States Football League.
 However, Rose dreamed of playing in the NFL and attended several training camps in the mid-1980s, only to be rejected each time.
 He received an opportunity with the New York Jets in 1987 during the strike by the players union, and became one of the few "scabs" to stay on the roster when the regular players returned to work.
 Rose remained with the Jets through 1989.
 In 1990, he split playing time with the Cleveland Browns and the Philadelphia Eagles, released by the Browns (along with head coach Bud Carson) after the seventh game and signing with the Eagles for their final 8 regular-season games.
 Rose remained with the Eagles through the 1994 season.
Fred John Hageman (born June 30, 1937 in Bunkie, Louisiana) is a former American football linebacker in the National Football League for the Washington Redskins.
 He played college football at the University of Arkansas and University of Kansas, and was drafted in the 2nd round in 1959 by the Oakland Raiders but did not report and returned to Kansas to finish his undergraduate degree and play out his senior season where he was a 2 time All Big 8 selection as a center and middle linebacker.
 He was a Tri-Captain and played in 4 post season games including the College All-Star game with numerous All Americans.
 Was drafted in the 7th round of the 1960 NFL Draft by the New York Giants and was immediately traded to Washington for cash and a high draft pick.
 He was the "Tribe's" defensive leader and starting middle linebacker upon reporting to camp.
 He was a runner-up for Rookie of the Year as a middle linebacker and played more minutes than any other player in the NFL in 1961.
 After his first stellar season, he was moved to starting Center where he played at an elite level.
 He was traded to the Chicago Bears in 1965, where he was injured in a pre-season game.
 Although urged to return by many, Fred returned to Kansas and earned his master's degree in Education.
 He went on to a very successful business career.
 The "gentle giant" at a huge 6 foot 5 and 255 pounds of solid muscle with world class speed, Fred was named as Kansas University's "Center of the Century" and was named to its first team "All-Time KU Football Team" along with the likes of Gayle Sayers, John Hadl and other NFL greats.
 Known as "Pappy" to many, he led KU's team, to a #2 Ranking and a Big 8 Championship in 1960.
 Some believe the teams he led in 1959 and 1960, along with John Hadl, were the best in KU's history.
 Fred was enshrined in the Batesville, Arkansas Area Sports Hall of Fame in 1992.
 He was the first All-State Athlete at Batesville, H.S.
This Old Cub is a documentary film which was released in 2004.
 The film is centered on former Chicago Cubs third baseman Ron Santo and both his playing days and his battle against diabetes.
 The film was written, co-produced, and directed by Santo's son Jeff.
 It is often mentioned during Cub game broadcasts by Pat Hughes, who was Santo's partner in the WGN Radio booth.
 The film was a gift from Jeff to his father as a part of the "Ron Santo Day" celebration that season after Santo had both his legs amputated and had just missed induction into the MLB Hall of Fame a few months earlier.
 A portion of all proceeds from the release of "This Old Cub" are donated to the Juvenile Diabetes Research Foundation.
 The film has raised over a half-million dollars for the JDRF.
 Cub shortstop Ernie Banks, Gary Sinise, Bill Murray, former Chicago Bears linebacker Doug Buffone, and many others are interviewed in the film, which is narrated by actor Joe Mantegna.
Douglas John Buffone (June 27, 1944 – April 20, 2015) was an American football linebacker in the National Football League.
 Buffone, the son of a coal miner (whose parents were Italian immigrants from the southern province of Cosenza, regione di Calabria), attended high school at Shannock Valley High School in Rural Valley, Pennsylvania.
John Perry "Jack" Pardee (April 19, 1936 – April 1, 2013) was an American football linebacker and the only head coach to helm a team in college football, the National Football League, the United States Football League, the World Football League, and the Canadian Football League.
 Pardee was inducted into the College Football Hall of Fame as a player in 1986.

Question: Which of the people interviewed in This Old Cub was an American football linebacker in the National Football League?
Answer: Doug Buffone