Simon has practiced in the London market since 1984. His main areas of focus are in coverage disputes usually with an international element, involving insureds, insurers or reinsurers in the London, European, US, Australian or Caribbean markets.

He deals with regulatory matters for both individuals and companies in the London market and employment matters where they concern the movement of individuals or teams within the market itself.

Simon also has a substantial practice acting as a Privy Council and conducts a wide variety of cases taking them, where required through the process of obtaining special leave to appeal, to full hearings. Jurisdictions that Simon deals with include; Belize, Bermuda, Bahamas, Jersey, Trinidad and Turks Caicos.