Dr. Sun specializes in economic analysis for antitrust, intellectual property and other commercial dispute matters. His experience includes economic analysis in merger review, price fixing, and abuse of dominance cases on antitrust issues, and economic analyses and damage calculations in patent, copyright, trademark, and trade secret cases. He has testified in both U.S. and Chinese court cases.
Washington, DC
Su Sun specializes in economic analysis for antitrust, intellectual property and other commercial dispute matters. His experience includes economic analysis in merger review, price fixing, and abuse of dominance cases on antitrust issues, and economic analyses and damage calculations in patent, copyright, trademark, and trade secret cases. He has testified in both U.S. and Chinese court cases.
Dr. Sun has particular expertise in China’s antitrust and IP matters. He has worked extensively on antitrust cases before the State Administration for Market Regulation (SAMR) and its predecessor antitrust agencies. In addition, he has submitted expert reports and testified in several antitrust and IP cases before several Chinese courts.
Regularly writing on antitrust issues, Dr. Sun’s work in English has appeared in the Antitrust Law Journal, European Competition Law Review, Antitrust Source, Journal of Competition Law and Economics, Journal of Antitrust Enforcement, CPI Antitrust Chronicle, Emerging Markets Finance & Trade, and newsletters and books. He was among the main authors commenting on draft regulations and guidelines for antitrust and IP in China on behalf of the American Bar Association’s Antitrust Section and International Section. His Chinese work has appeared in several Chinese journals and magazines.
Lexology Index (formerly Who’s Who Legal) describes Dr. Sun as “a clear leader in the field of competition economics, with deep expertise in merger review, price fixing and abuse of dominance matters.” Lexology research further recognizes Dr. Sun for his work on complex antitrust and intellectual property matters with a particular focus on China, where he has served as an expert witness before numerous Chinese courts and has been repeatedly retained by regulatory authorities to conduct economic analyses in merger and acquisition reviews. He is further recognized as someone who “possesses profound knowledge and experience in antitrust economics,” and “provides objective and professional economic advisory whilst always trying to understand the business rationale of the client.”
While at the University of Michigan, Dr. Sun taught undergraduate and MBA economics courses. He also taught antitrust economics in a summer course at Renmin University of China.
Dr. Sun served on the editorial board of the Antitrust Law Journal from 2009-2026.
Secretariat Experts Recognized in Lexology’s 2026 Competition Report
Five Secretariat experts have earned recognition in the Lexology Index 2026 Competition report for their work on complex antitrust and competition engagements.
Su Sun Speaks at NABE Transfer Pricing Symposium
Managing Director Su Sun spoke on a panel at the National Association of Business Economics Transfer Pricing Symposium. Dr. Sun discussed the potential application of tools used in the determination of FRAND rates for licensing Standard Essential Patents to transfer pricing analysis. Download the presentation here.
Secretariat Recognizes Newly Promoted Professionals Across 10 Offices
Secretariat, the leading disputes, forensics, and expert witness advisory firm, is pleased to announce the promotion of professionals across 10 offices: Atlanta, Dubai, Hong Kong, Houston, London, Los Angeles, New York, San Francisco, Toronto, and Washington, DC.