[3] Having spent time training with the Forth Valley Football Academy, he began his professional career with Falkirk, making his senior debut in a league game on 12 April 2015.
[4] After strong performances for the club's Development League team, he was in contention for a place in the squad for the 2015 Scottish Cup Final, although in the end he was not selected.
[5] He spent a loan spell with East Fife between July 2016 and January 2017,[6] scoring 3 goals in 19 appearances in all competitions.
[7] In November 2017 he received an 8-match 'excessive misconduct' ban for abusing Dean Shiels about his disability during a game against Dunfermline Athletic.
[13] After an impressive year with Alloa during which he scored 14 goals in 35 matches, O'Hara signed a three-year contract with Dunfermline Athletic on 10 July 2020.