[2] In 2011, he competed in the Universiade, winning a bronze medal in the men's 4 x 100 m medley relay.

[3] At the 2012 Summer Olympics he competed in the men's 400 metre freestyle, finishing in 15th place in the heats, failing to reach the final.

At the 2012 World Short Course Swimming Championships Stanley finished fourth in the 400 m freestyle but the third-placed finisher, Mads Glæsner, was subsequently disqualified after a doping infringement and Stanley was promoted to the bronze medal position.

[6] As of 2024, he also holds the New Zealand men's 200 m freestyle and 200 m backstroke records in the 25 m pool.

[7] He was also part of the team that holds the New Zealand men's 4 x 200 m relay record.