Professor Riley specialises in two principal areas. In the field of competition law he is one of the leading scholars in the United Kingdom. He co-founded and chairs the European-wide Competition Law Scholars Forum and is co-editor of the Competition Law Review. He also specialises in energy law, particularly in relation to the market and strategic questions in relation to pipeline gas and LNG.
In his competition law research he has focused on procedural issues in European competition law, notably in relation to the Commission's modernisation project and human rights questions.
Professor Riley also advises governments, the EU institutions, NGOs and corporations on major strategic problems in relation to abuse of dominance, price-fixing and merger cases, as well as in relation to strategic problems found in the global and European energy markets. He is also a Research Fellow of the British Thinktank Republica and is also an Associate Research Fellow of the Centre for European Policy Studies in Brussels, and is a regular guest columnist on competition law issues with the Wall Street Journal.