O'Brien replaces Marty Galbraith, who served as Duke's offensive coordinator in 2004.
The Andover, Mass., native comes to Durham after spending the last two seasons on the staff at Maryland, where he coached the running backs and helped the Terrapins to a 15-9 overall record and a Gator Bowl victory over West Virginia in 2003.
A 1992 graduate of Brown, O'Brien served eight seasons on the staff at Georgia Tech, coaching alongside current Duke staffers Roof, David Kelly and Glenn Spencer during the tenure. He was a graduate assistant on offense from 1995-97 before being elevated to coach the running backs for the next three seasons. In each of his three seasons coaching the running backs, the Yellow Jackets finished no lower than third in the ACC team rushing rankings, and the 1998 Tech club went 10-2, captured the league title and defeated Notre Dame in the Gator Bowl.
In his final two campaigns in Atlanta, 2001-02, O'Brien served as the offensive coordinator while coaching the Yellow Jacket quarterbacks.
Georgia Tech's 2001 offense, featuring 1,000-yard rusher Joe Burns and the ACC's leading passer George Godsey (3,085 yards), led the league in passing while ranking third in scoring. Burns, wide receiver Kelly Campbell and offensive tackle Nat Dorsey all earned First Team All-ACC accolades for their efforts that season while Godsey went on to capture MVP honors of the 2001 Seattle Bowl. Georgia Tech won 15 total contests during O'Brien's two-year stretch as offensive coordinator while playing in a pair of bowl games (2001 Seattle Bowl & 2002 Silicon Valley Football Classic). He also spent two seasons (1999-00) as Tech's recruiting coordinator and his last year (2002) as an assistant head coach. O'Brien got his start in coaching at his alma mater, coaching the tight ends in 1993 and the inside linebackers in 1994. He was a three-year letterwinner as a linebacker and defensive end at Brown from 1990-92, and graduated in 1992 with a bachelor of arts degree with a double concentration in political science and organizational behavior management.
Born October 23, 1969, O'Brien is married to the former Colleen Corron and the couple has one son, Jack, who was born in August of 2002.