Mattias Nilsson

Mattias Nilsson is the PCAOB’s Acting Deputy Chief Economist, Economic Analysis. In this position, he is responsible for the process and teams that develop the economic analysis for standard-setting and rulemaking projects and for the post-implementation review of their effectiveness. Dr. Nilsson joined the PCAOB in September 2026 as the Senior Adviser to the PCAOB’s Chief Economist.

Prior to joining the PCAOB, Dr. Nilsson was a Principal Financial Economist in the Office of Corporate Finance in the Division of Economic and Risk Analysis at the U.S. Securities and Exchange Commission, where he conducted economic analysis of rulemakings and provided economic advice and research on securities market developments.

Before joining the SEC, Dr. Nilsson served as assistant professor of finance at the University of Colorado at Boulder and Worcester Polytechnic Institute.

Dr. Nilsson has published research in academic journals such as Journal of Finance, Journal of Financial Economics, Review of Financial Studies, and Journal of Financial and Quantitative Analysis. He earned his Ph.D. in Finance from Stockholm School of Economics in Sweden.