Thia was a member of the main cast of Comedy Nite throughout its run. Although he had many roles in various sketches, his most memorable role is probably Lion King in the sketch series Liang Ximei. He made a transition to English television in 2004, where he played the recurring role of Georgie Gan in Police & Thief.
Thia is also known to the public for his strikingly similar looks to Singaporean politician Khaw Boon Wan, a fact he often acknowledges by jokingly referring to Khaw as his twin.
