Career
He competed for Australia at the swimming at the 2012 Summer Olympics. His personal best in long course events are 52.11 for the 100 metre backstroke and 1:53.17 for the 200 metre backstroke, both set at the Dubai world cup in November 2015. In November 2015, Larkin broke the short course world record in the 200-metre backstroke, lowering it to 1:45.63.