2009-10: Competed during the indoor season in the 200-, 300-, 400- and 500-meter dashes and recorded a BIG EAST qualifying time of 1:05.45 on Dec. 4 at the Blue and Gold Invitational in the 500...At the BIG EAST Indoor Championships, competed in the 4x400-meter relay along with Randey Fisher, Jay Emmer and Kyle Winter and finished 11th in 3:21.23...Also won the event with that relay team at the dual meet vs. Milwaukee on Jan. 23 in 3:25.37...During the outdoor season recorded three BIG EAST marks in the 400-meter hurdles with a top time of 54.87 seconds at the Lee Calhoun Invitational on April 10...Competed in the 400 hurdles (18th in prelims, 56.36 sec.), 4x100 (9th, 43.08 sec.) and 4x400 (12th, 3:21.60) at the BIG EAST Outdoor Championships.
2008-09: Ran a personal best time of 50.88 in the 400m at the Grand Valley meet...Ran an indoor personal best time and placed third in the 500m at the Blue and Gold Invitational...Surpassed personal record in the 400m at the Grand Valley Invitational, finishing in 50.88...Bested his personal for the second time of the season in the 500m. finishing in 1.05.04, a BIG EAST qualifying time, at the Notre Dame Invitational...Ran a personal and indoor season best time of 50.27 in the 400m at the Meyo Invitational...Ran BIG EAST Qualifying times in the 400m hurdles at five meets leading up to the BIG EAST Outdoor Championships...Took first in the 400m hurdles at the MU vs. UWM Dual meet, finishing in 54.31...400m Hurdle champion at The Marquette Twilight meet...Ran a personal best time of 53.80 in the 400m hurdles at the BIG EAST Outdoor Championships, finishing 13th overall.
2007-08: In the first meet of the indoor season, ran a 1:06.60 in the 500m at the Notre Dame Blue and Gold Invitational to finish fourth...During the outdoor season at the Missouri Relays, finished fourth in the 400m hurdles, recording a BIG EAST-qualifying time of 55.19 seconds to finish fourth...Also ran in the 200m at the Missouri Relays and set a personal record with a time of 22.77 seconds...Finished third at the Mike Poehlein Invitational, registering another BIG EAST-qualifying time in the 400m hurdles with a time of 55.04 seconds...Finished fifth in the 400m hurdles at the Iowa Invitational and second at the Marquette Twilight meet...Ran a 55.65-second 400m hurdles at the BIG EAST Outdoor Championship...Finished third in the 400m hurdles at the Wisconsin Twilight meet with a season-best time of 54.14 seconds...Member of 4x200 and 4x400m relay team that took second in each event at the DePaul relays.
2006-07: Ran indoor season bests in the 60m hurdles (8.74) and the 400m (51.83) at the Redbird Open... At the indoor Notre Dame Invitational ran the 500m in 1:08.38... Ran outdoor season bests in the 200m (23.01) at the Wisconsin Twilight and the 400m hurdles (53.83) at the Gregory Invitational...
High School: O'Brien was a four-year letterwinner at Prospect High School competing in sprint hurdle events ... He earned team MVP honors, while helping the Knights to four straight Mid-Suburban League East Division Championships and a sectional championship in 2005 ... O'Brien placed third at the state championship in the 300m hurdles in 2006.
Personal: O'Brien was born on September 15, 1987 and is the son of Michael and Ellen O'Brien ... He has two younger brothers, Kevin and Danny ... O'Brien is majoring in electrical engineering.