The Chicago Bears picked Brown in the fourth round of the 2002 NFL draft, and he also played for the New Orleans Saints.

[3] As the Trojans' senior quarterback in 1996, Brown threw for 863 yards and four touchdowns, and rushed for 767 yards and eighteen touchdowns; as a starting linebacker, he also compiled 117 total tackles (with seven tackles for loss), five blocked passes, four fumble recoveries, two forced fumbles and two blocked field goals.

[3] He was honored as a Florida Class 3A all-state selection and a National Recruiting Adviser and SuperPrep high school All-American.

[3] Brown was also a standout basketball player and track and field athlete, and was the state champion discus thrower in 1996.

[3] Arguably, he played his best college game on September 18, 1999, when he sacked quarterback Tee Martin five times in the Gators' 23–21 upset of the second-ranked Tennessee Volunteers.

[10] In a game against the New York Giants on November 7, 2004, Brown recorded a career-high four sacks to go along with eight tackles, including six solos stops.

Brown was a first-alternate for the Pro Bowl after recording 75 tackles (nine for a loss) and six sacks, eight broken up passes and three forced fumbles during the 2005 season.

He ranked second on the defensive line with fifty-eight tackles and added five quarterback hits, 4.5 sacks, one interception, two forced fumbles and a blocked kick.

[13] In his nine-season NFL career, Brown played in 143 regular season games, started 123 of them, and compiled 421 tackles, 43.5 quarterback sacks, forty-two deflected passes, seventeen forced fumbles with twelve recovered, and five interceptions.

[16] He is a Republican precinct committeeman in Vernon Hills, Illinois where he resides with his wife, Kari, who serves as a village trustee.