Jack heads the Litigation practice at Rahmat Lim & Partners. His areas of practice include corporate, banking, industrial relations and employment law litigation. Jack’s extensive experience includes, among other things, acting for a local financial institution leading to recovery of a multi-million ringgit facility from a public listed company, obtaining a favourable KLRCA (AIAC) arbitration award for the Malaysian subsidiary of a public listed German company in a multi-million USD contractual dispute, acting in a judicial review application and obtaining a declaration and an order of mandamus compelling a local authority to issue a certificate of fitness and occupation for a shopping mall, acting on behalf of a multinational company in the successful suit of its former chief executive officer for negligence and breach of directors’ duties, and advising receivers and managers of companies in receivership as well as acting for liquidators in insolvency proceedings. 

Jack is consistently recognised by legal publications including Chambers Asia-Pacific for his professionalism. The publication noted him as being "very professional, ethical and really humble" and, he is described as "very knowledgeable". The Legal 500 Asia Pacific recognized that Jack "gives sound advice" and quoted him as giving "pragmatic advice and out-of-the-box thinking". Jack was also listed as a Local Disputes Star in the Benchmark Asia-Pacific.

Jack obtained the University prize for distinguished performance in the LL.B. examination from the Board of Examiners of the University of London’s External Programme. He pursued his postgraduate degree at the University of Malaya and obtained his LL.M. (Hons) Malaya degree in October 2001. He is on the Asian International Arbitration Centre (AIAC) panel of adjudicators and is a member of the Bar Council Disciplinary Committee, Corporate & Commercial Law Committee and the Industrial & Employment Law Committee.