Career
Williamson"s first senior season came in 1998 playing for the Maroochydore Clippers of the QABL, and continued to play for them until 2003, winning club Most Valuable Player from 1999–2003. In 2004, he moved to the Brisbane Capitals. Then from 2005 to 2008, he played for the Southern Districts Spartans (now known as the Brisbane Spartans).
In 2010, he played for the Caboolture Suns.
In 2011, he played for the Ipswich Force. He again played for Rockhampton in 2015 and averaged 15.3 points in 17 games.
He retired from playing following the 2015 season.