Simon's practice is primarily in the field of international commercial arbitration and litigation. He is regularly instructed both alone and as junior counsel in commercial disputes, especially commodities, shipping, shipbuilding (and off-shore installation construction), insurance, banking and finance, and derivatives. Since September 2010, Simon has practised from 20 Essex Street's Singapore annex at Maxwell Chambers, Singapore. Simon is ranked as a leading arbitration junior by Chambers Asia-Pacific 2015 under its 'Singapore:the English Bar' section.
Simon is a co-editor of the forthcoming 12th Edition of MacGillivray on Insurance Law (having also contributed to the two supplements to the 11th Edition).
Simon is also a member of the Bar of the British Virgin Islands.