On contract with the Brisbane Broncos from a young age, Seymour was a standout school boy performer, leading the St Patrick's Mackay schoolboy side to victory in the Confraternity Cup.

[4] After a mixture of promising football and injury woes as the Brisbane Broncos' new halfback, Seymour departed the club in 2007 over disciplinary issues.

Seymour had a number of stand-out games including one against the Eels when he kicked a 35-metre field goal in the fifth minute of golden point extra time to steer his side to a thrilling 25–24 victory.

When he was coming to the end of his first Cronulla contract Seymour was linked with a move to London-based Super League franchise Harlequins, however he signed a further two-year deal to stay at the Sharks.

[5] Seymour's 2008 season ended unfortunately when he injured his knee in week two of the finals in a team game of soccer where he collided with fellow shark, Danny Nutley.

[13] He temporarily took over the head-coach role when at Whitehaven RLFC following Steve Deakin's unexpected departure, and then was assistant coach when James Coyle was appointed.