He played as a prop in the National Rugby League for the Cronulla-Sutherland Sharks and the Penrith Panthers as well as representing for the Queensland Maroons in State of Origin.

In 1999, Lang played 23 games as Cronulla won the minor premiership but suffered preliminary final heartbreak against St. George at Stadium Australia.

"[8] Lang played at prop forward for the Penrith Panthers in their 2003 NRL grand final victory over the Sydney Roosters.

As 2003 NRL premiers, the Penrith travelled to England to face Super League VIII champions, the Bradford Bulls in the 2004 World Club Challenge.

He is a former professional NRL and State of Origin Rugby League player and is a member of the Australasian Neuroscience and International Neuropsychological societies.