Ronald J. Allen (born July 14, 1948) is an American legal scholar and the John Henry Wigmore Professor of Law at Northwestern University. [1] He is an expert in evidence law, criminal procedure, and constitutional law. [2] Recognized by The New York Times as a preeminent national expert on evidence and procedure, his career spans over five decades of influential teaching, theoretical innovation, and international legal reform. [3]
Allen graduated magna cum laude from Marshall University in 1970 with a B.S. in mathematics. [4] He received his J.D. magna cum laude from the University of Michigan Law School in 1973, where he was a member of the Order of the Coif. [1]
Allen began his academic career at the University of Nebraska–Lincoln (1973–1974) and the State University of New York at Buffalo (1974–1979). He later held professorships at the University of Iowa College of Law and Duke University School of Law. [4] [5]
In 1984, he joined Northwestern University, and in 1992, he was appointed the John Henry Wigmore Professor of Law. [5] He serves as the President of the International Association of Evidence Science. [2] Throughout his tenure, he has held various leadership roles, including serving as the founding president of the International Association of Evidence and Procedure. [5]
Allen is known for his work on the theoretical foundations of juridical proof. He is the primary architect of the Relative Plausibility theory, which challenges traditional mathematical and probabilistic models of evidence. [6] His theory argues that legal fact-finding is an inference to the best explanation, where jurors and judges evaluate competing stories based on coherence and consistency. [5] This explanatory account is a central pillar of modern evidence theory.
His scholarship has a significant international footprint; he is the 24th most cited American legal academic in China. [7] In 2025, scholars in both Spain and Portugal published translations of his articles. [8]
Allen has served as a legal consultant to the governments of Tanzania and the People's Republic of China regarding evidence law reform. [9] For over 20 years, he has advised the Supreme People's Court of China and serves as the President of the Board of Foreign Advisors for the Evidence Law and Forensic Science Institute at the China University of Political Science and Law (CUPL). [5]
Allen is the author of over 160 articles and several foundational textbooks: [5]