AS A JUNIOR: Backup left offensive guard for Irish in 2000 . . . saw playing time as reserve offensive lineman in all 12 games, including vs. Oregon State in 2001 Tostitos Fiesta Bowl . . . played nearly 17 minutes vs. West Virginia after turf toe injury to Jim Jones - and played more than 12 minutes vs. Oregon State in Tostitos Fiesta Bowl.
AS A SOPHOMORE: Played in first career game vs. Kansas in '99 as one of six appearances overall . . . played extensively as backup to John Teasdale vs. Oklahoma and Arizona State . . . missed Navy game with ankle sprain . . . played entire second half vs. Pittsburgh after Teasdale left with injury . . . made first career start vs. Boston College, replacing the injured Teasdale, but suffered dislocated right shoulder vs. Boston College, keeping out of finale at Stanford.
AS A FRESHMAN: Did not play in a game as rookie defensive lineman in '98.
HIGH SCHOOL AND PERSONAL DATA: USA Today honorable mention prep All-American . . . earned four letters in football at Jenks High School in Jenks, Okla. . . . played on '97 Jenks team some considered greatest in Oklahoma prep history, making 95 tackles (56 for loss) plus seven sacks . . . coaches listed him with more than 100 pancake blocks as both junior and senior . . . had 74 tackles (34 for loss), two fumbles caused and two fumble recoveries as defensive lineman in '97 . . . helped '97 team to 14-0 record and Oklahoma Class 6-A state championship . . . three-year starter who did not allow a sack as junior on offense . . . helped Jenks to four straight conference titles, three regional titles and combined four-year mark of 49-3 . . . captain of team and MVP as senior . . . two-time all-conference and all-city pick . . . earned letters in wrestling as freshman sophomore heavyweight . . . father (Michael, a '64 graduate), sister (Lisa, a '94 graduate) and uncle are Notre Dame graduates . . . former prep teammate of '98 senior Irish offensive linemen Jerry (he played with Chicago Bears in '99) and current senior defensive lineman Andy Wisne . . . full name is Sean Christopher Mahan . . . younger of two children . . . born 5-28-80 in Tulsa . . . earned 3.133 grade-point average during 2000 spring semester . . . enrolled in College of Arts and Letters as psychology major.