|Team:||Men's Track and Field, Men's Cross Country|
O'Brien was American University's firs four-time All-American in any sport.
He finished 10th in the 1,500-meter run at the NCAA Championships as a sophomore, then followed that with an 11th-place finish in 2002 before earning fourth in the same event in 2003.
He also ran on American's distance medley relay squad which earned All-America status with an eighth-place finish at the NCAA Indoor Championship in 2003.
O'Brien won three individual titles at various Patriot League championships, including the mile in back-to-back indoor seasons.