McSweyn grew up on a beef and sheep farm on King Island (population ~1,600) in the middle of Bass Strait, south of Melbourne, Victoria.

Being away from home at a young age, he built resilience which helps him cope with being overseas for lengthy periods of time.

At Ballarat, he was coached by Rod Griffin, middle- and long-distance runner Collis Birmingham, and his now training partner Brett Robinson.

Notably, at the Bruxelles Memorial van Damme Diamond League Final, McSweyn achieved a 13:05.23 personal best over 5000m, finishing 12th in the race.

[7] In February 2023 at the World Athletics Cross Country Championships, held in Australia, McSweyn achieved a bronze medal in the mixed relay, alongside Oliver Hoare, Jessica Hull and Abbey Caldwell.