[1] After graduating from high school, he played college football in the Pac-10 for the University of California, Los Angeles, where he gained prominence on the Bruin defensive unit.
Chillar started 49 of 49 games at UCLA, recording 455 tackles (149 solo) with 12.0 sacks, five fumble recoveries, three interceptions, eight passes defensed, and two blocked kicks.
He led the team with career-high 683 tackles (72 solo), 35.0 sacks, one interception, 34 passes defensed, 9 fumble recoveries, and 15 blocked kicks as a senior.
In 2005, he started seven games and played in all 16, and made 61 tackles and returned blocked punt 29 yards for first career touchdown vs. Jacksonville October 30, 2005.
On March 18, 2008, the Green Bay Packers signed Chillar to a two-year, $5.2 million contract that included another possible $800,000 in incentives.
Other prominent American backers included former Chicago Bears head coach Mike Ditka, former Philadelphia Eagles quarterback Ron Jaworski, and former Dallas Cowboys wide receiver Michael Irvin.