Collin is a commercial lawyer called in 1993 who has handled a wide range of advisory, litigation, arbitration and appellate matters.  These include admiralty, commercial and marine insurance, international sale of goods, and shipping and maritime law (including charterparty disputes and cargo claims, shipping collisions and other shipping casualties, ship building and repair disputes, and ship sale disputes).

He has acted as counsel in litigation, arbitration and appellate proceedings in Singapore, and has been appointed an arbitrator in maritime cases.

Collin is on the Panel of Arbitrators of the Singapore Chamber of Maritime Arbitration, a Fellow of the Singapore Institute of Arbitrators, and a representative of the Singapore Law Society on the Singapore Admiralty Court Users Committee.