He played college football for the LSU Tigers and was selected by the St. Louis Rams in the first round of the 1996 NFL draft.
Kennison also played for the New Orleans Saints, Chicago Bears, Denver Broncos, and Kansas City Chiefs.
Kennison attended Washington-Marion High School in Lake Charles, Louisiana, and was a star in both football and track.
[citation needed] Kennison was a noted sprinter in college, where he was a six-time All-America selection.
It was noted regularly at the time that Kennison and Glenn had outproduced number one overall pick Keyshawn Johnson.
On February 22, 2000, the Saints traded Kennison to the Chicago Bears for a fifth-round pick in the 2000 NFL draft.
Kennison's decision was reportedly due to his wife's complicated pregnancy and his father's heart attack.
As a member of the Chiefs, from 2002 to 2006 Kennison averaged 59 receptions, 961 yards, and 5 touchdown catches during this span.
Kennison signed a one-day ceremonial contract with the Chiefs on July 19, 2010, so he could retire as a member of the team.