Kuppan has specialised in commercial litigation involving contentious and non-contentious work since 1991. His practice includes corporate and contractual disputes, competition law, contentious advisory work, insolvency work and disputes involving construction and building contracts.

He has presented papers at seminars and conferences on construction law and other litigation related topics, both in Singapore and abroad. He is also a part-time Tutor at the Postgraduate Practice Law Course organised by the Board of Legal Education.

Kuppan has worked with foreign counsels, including Queen's Counsel and other specialist professionals on various matters and before a variety of tribunals. He has attended and worked on both local and international arbitrations.  He has acted for clients in proceedings before the Court of Appeal, High Court and the Subordinate Courts.

Kuppan graduated from the University of Hull, England, with a Bachelor of Law (LL.B (Hons) degree in 1988. He was called to the English Bar and admitted as a Barrister-at-Law, of the Middle Temple, England, in 1989.