Choon Siong graduated from University of Sheffield in 2006 and was called to the English Bar in October 2007 and subsequently admitted to the Malaysian Bar as an Advocate & Solicitor of the High Court of Malaya in October 2008 after completing his pupillage at Messrs. Albar & Partners.

Choon Siong has been practicing as a conveyancing and corporate lawyer under few law firms in Kuala Lumpur. He then joined Messrs. Ben Lee & Sharen in October 2024 where he continues to specialize in various conveyancing matters such as sale and purchase agreements, retail and corporate loans, tenancy and corporate matters.