He played college football for the Michigan Wolverines and was selected by the Falcons in the first round of the 1978 NFL draft with the 13th overall pick.
He was selected as a first-team All-Pro player in 1980, 1983 and 1991 and was invited to play in the Pro Bowl five consecutive years from 1980 to 1984.
[3] As a sophomore, Kenn started nine games at left tackle for the 1975 Michigan Wolverines football team that compiled an 8-2-2 record, scored 324 points, finished the year ranked #3 in the final AP Poll,[4] and rushed for 3,840 yards (320 yards per game).
[9] He started all 16 games for the Falcons at left tackle and was named to the NFL all-rookie team in 1978.
[10] In 1980, Kenn was voted consensus All-Pro and was not flagged for a penalty all season and allowed just three-and-a-half sacks.
He had remarkable penalty free streak of 26 consecutive games (New Orleans, 11/25/79 - St. Louis, 10/18/81) that included the entire 1980 season.
Head coach Dan Henning said, "He's got the physical gifts, he's bright, and now he has a great deal of experience, "That's the desirable combination.
"[13] In 1988 Kenn was called for only one holding penalty and allowed 6½ sacks and was voted as a Pro Bowl Alternate.
[16] In 2021, the Professional Football Researchers Association named Kenn to the PFRA Hall of Very Good Class of 2021.