Tommaso Valletti is Professor of Economics at Imperial College London, and also Professor of Economics at the University of Rome. He is currently the Head of the Department of Economics & Public Policyat Imperial College Business School. He is a Non-Executive Director to the board of the Financial Conduct Authority. He was the Chief Competition Economist of the European Commission (Directorate General for Competition) between 2016 and 2019, when he led the economic analysis on many large mergers (e.g. Deutsche Börse/London Stock Exchange, Dow/DuPont, Bayer/Monsanto, Microsoft/LinkedIn, Siemens/Alstom), state aid, and antitrust cases (e.g. Google Shopping, Google Android, Google AdSense, Qualcomm exclusivity, Qualcomm predation, Mastercard and VISA). Tommaso has a magna cum laude degree in engineering and a flute diploma from Turin, and holds a MSc and a PhD in economics from the London School of Economics. He has published in the fields of industrial economics, regulation, and competition economics; for a full list see http://ideas.repec.org/f/pva219.html.