The 2003 NCAA Swimmer of the Year after setting four NCAA, American, U.S. Open and school records as well as winning four titles and earning six NCAA All-America honors and one NCAA All-America Honorable Mention award. Set a new American, NCAA, U.S. Open and school record in the prelims of the 200-yard backstroke at the NCAA Championships (3/27-29) with a time of 1:40.01. Broke his own American, NCAA, U.S. Open and school record in the finals of the 200-yard backstroke at the NCAA Championships when he became the first person ever to go under 1:40.00 in the event with a time of 1:39.16. Aaron has just won the Men's 100m Backstroke Gold Medal in Athens 2004 Olympics.

High performances :
1999: Pan-Am Games - 2nd 200m backstroke (1:59.77)
2000: Olympic Games - 2nd 200m backstroke (1:57.35)
2001: LC World Championships - 1st 200m backstroke (1:57.13), 10th 100m backstroke (55.89)
2002: SC World Championships - 1st 200m backstroke (1:51.17, WR), 2nd 100m backstroke (51.71), 1st 4x100m medley relay (3:29.00, WR), Pan Pacs - 1st 100m backstroke (54.22), 1st 200m backstroke (1:56.88), 1st 4x100m medley relay (3:33.48, WR)
2003: LC World Championships - 1st 100m backstroke (53.61), 1st 200m backstroke (1:55.92), 8th 50m backstroke (25.75), 1st 4x100m medley relay (3:31.54, World Record), 2nd 4x200m free relay (7:10.26)

Personal best times :
Long course (50m) - 100m backstroke: 53.61 (2003); 200m backstroke: 1:55.92 (2003)

World Rankings (50m) :
1998: 20th 200m backstroke
1999: 57th 100m backstroke, 10th 200m backstroke
2000: 79th 50m backstroke, 8th 100m backstroke, 2nd 200m backstroke, 111th 200m Ind. medley
2001: 67th 50m backstroke, 4th 100m backstroke, 1st 200m backstroke.