The
Philadelphia Eagles selected Harrison in the fourth round of the
1978 NFL draft (92nd overall). He was drafted by future Hall of Fame head coach
Dick Vermeil, and played under Vermeil from 1978 to 1982. He played defensive end for the Philadelphia Eagles from 1978 to 1984, being selected to play in the
Pro Bowl in 1982. He became a full time starter at left defensive end in 1980, and started 68 games there for the Eagles from 1980 to 1984. His peak seasons came from 1982 to 1984, when he had 10.5, 11.5 and 12
quarterback sacks, respectively. His 11.5 sacks in 1983 led the Eagles defense. He went to
Super Bowl XV under Vermeil in the 1980 season, losing to the
Oakland Raiders, 27–10. Harrison was defensive team captain in 1984. He played in 12 games for the Rams in 1985, but did not start any games. The
San Francisco 49ers signed Harrison in July 1986. The 49ers waived Harrison in October 1986, and he was acquired by the
Atlanta Falcons. He did not start any games for either team that season. Over a 10-year NFL career, Harrison started 79 regular season games, with 61 quarterback sacks, seven fumble recoveries and one interception. == Honors ==