O'Hara played college football as a quarterback for the USC Trojans and was selected by the Tampa Bay Buccaneers in the 10th round (260th overall) of the 1991 NFL draft.

O'Hara attended Santa Monica High School, where during junior and senior seasons he threw at least one touchdown pass a game.

During his senior season, he passed for nearly 2,000 yards and 21 touchdowns in 10 games which earned him "Bay League Player of the Year" honors and selection to the Long Beach Press-Telegram's "Best in the West" team.

Marinovich, then a freshman, was given the starting job and helped lead the team to a Rose Bowl win against Michigan in Bo Schembechler's last game as a head coach.

O’Hara holds the unique distinction as the only quarterback selected in modern draft history without ever being a starter in a collegiate game.

He helped lead the Storm to a win in ArenaBowl XVII after starting Quarterback John Kaleo was injured late in the second quarter.

O’Hara began his coaching career at Point Loma High School in 1996, working with the Quarterbacks as a volunteer assistant.

However, the AFL cancelled its 2009 season, and on April 27, 2009, he was hired as the replacement of Richard Davis as head coach of the Tri-Cities Fever of af2.

More recently, O'Hara has worked as a color analyst for CBS Sports Network covering the Arena Football League (AFL).

O’Hara's previous off-seasons have included consulting work, coordinating and choreographing football action scenes in movies.

[8] He also has coached actors such as Adam Sandler, Mark Wahlberg, Dwayne Johnson and Glen Powell to better help them portray their characters.