Tommaso Valletti is a Professor of Economics and currently heads the Department of Economics & Public Policy at Imperial College London. He was the Chief Competition Economist of the European Commission between 2016 and 2019, when he led the economic analysis on many large mergers (e.g. Bayer/Monsanto, Microsoft/LinkedIn, Siemens/Alstom), state aid, and antitrust cases (e.g. Google Android, Qualcomm exclusivity, Mastercard and VISA). He has published in the fields of industrial economics, regulation, and competition economics.