Canadian Football League (1973) Danielson was not selected in the NFL draft and instead signed with the
Calgary Stampeders of the
Canadian Football League (CFL). He was cut after the Stampeders signed
Pete Liske. Danielson recalled: "I thought I was doing real well with Calgary. Then they get Liske and I'm out of a job." After he was released by Calgary, Danielson returned to Purdue where he became a graduate assistant in economics and a coach for the freshman football team. He also began reading "all material possible on the game of football", including
Woody Hayes's "Hotline to Victory" and
Dave Meggyesy's "Out of Their League", earning a reputation as a football "bookworm." Danielson completed 27 of 54 passes for 293 yards and one touchdown and no interceptions for Charlotte. In July 1975, the Hornets traded Danielson to the
Chicago Winds in exchange for a 1976 WFL draft pick. Danielson completed nine of 15 passes for 107 yards. He was cut shortly before the opening game of the regular season, He remained on the bench during the 1976 season, with no pass attempts, as
Greg Landry was the team's starting quarterback and
Joe Reed was the backup. In 1977, Danielson began the season as a backup to
Greg Landry but appeared in 13 games with two starts and 445 passing yards. In August 1979, Danielson injured his knee in a preseason game, underwent surgery, and missed the entire 1979 season. Forced to start rookie
Jeff Komlo after an injury to backup QB
Joe Reed, the
Lions tied the
49ers for the NFL's worst record at 2-14. Danielson returned to the Lions in 1980 and had the best season of his career. He started all 16 games, completing 244 of 417 passes (58.5%) for 3,223 yards with 13 touchdowns and 11 interceptions. He also rushed for a career-high 242 yards on 48 carries (4.8 yards per carry). Danielson also became embroiled in a squabble with Detroit general manager
Russ Thomas in November 1980, accusing Thomas in an interview of "behind-the-scenes meddling", suggesting a change at quarterback, and failing to keep the disgruntled Lions players happy. In 1981, Danielson lost the starting quarterback job to
Eric Hipple. Danielson started only four games and completed 56 of 96 passes (58.3%) for 784 yards, three touchdowns and five interceptions.The Lions lost the NFC Central Division championship when they were defeated at home in the season finale by Tampa Bay. and his 3,076 yards was the second hightest single-season total in Lions history – trailing only Danielson's 1980 total.
Cleveland Browns (1985–1988) In May 1985, the Cleveland Browns acquired Danielson as a backup to rookie
Bernie Kosar. Danielson ended up starting six games for the Browns in 1985, completing 97 of 163 passes (59.5%) for 1,274 yards with eight touchdowns and six interceptions. Danielson broke an ankle in the 1986 preseason and missed the entire season. Kosar became entrenched as the Browns' starting quarterback, and Danielson saw limited action thereafter. In 1987, he appeared in six games, only one as a starter, completing 25 of 33 passes (75.8%) for 281 yards, four touchdowns, zero interceptions, and a 140.3 quarterback rating. In 1988, his final year in the NFL, Danielson completed 31 of 52 passes (59.6%) for 324 yards. In April 1989, the Browns announced that they would not offer a new contract to Danielson.
NFL career statistics Danielson amassed 13,764 passing yards, 1,105 pass completions, and 81
touchdown passes in 101 games in the NFL.
Regular season Postseason ==Broadcasting career==