As of the end of 2024, Mathias Siems's scholarly work has received over 5800 citations,[2] and his work at Durham University has been submitted as an impact case study for the 2021 Research Excellence Framework.[3]
Within the field of private law, Siems has published extensively on matters of European and comparative corporate law. Siems was one of the authors of a report on the law applicable to companies in the European Union,[4] which the European Commission has cited to justify the introduction of a policy package on company law.[5] His 2007 book Convergence in Shareholder Law provides an extensive empirical study of the laws on shareholder rights in the United States, United Kingdom, Germany, France, Japan, and China, which received positive reviews in leading scholarly journals.[6][7] Together with David Cabrelli, Siems edited the book Comparative Company Law: A Case-Based Approach, which has been describer by scholars as offering a comprehensive introduction to company law in various countries.[8] His work has also been credited as leading the World Bank to adjust the index used in its Doing Business report.[3]
Mathias Siems is also known for his work on the methods of comparative law. His textbook on comparative law, now in its third edition,[9] has been described as part of a "rebirth of [comparative law] as a genuinely scholarly field of research."[10] More recently, Siems and Po Jen Yap edited the Cambridge handbook of comparative law, credited with an expansion of the geographical and methodological coverage of comparative legal research.[11]
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