“Epistemology and the Law of Evidence: Problems and Projects”–the most recent of these essays–is based on a talk given at a 2012 workshop on legal epistemology organized by Rachel Herdy in the law faculty at the Universidade Federal do Rio de Janeiro, Brazil. It was also presented, in an abridged form and under the title “Problems and Projects in the Theory (and Practice) of Evidence Law,” as an after-dinner speech at the 2013 conference of the Canadian Institute for the Administration of Justice. “Epistemology Legalized: Or, Truth, Justice, and the American Way” was my Olin Lecture in Jurisprudence at the Notre Dame Law School, and appeared in the American Journal of Jurisprudence 49 (2004): 43–61. “Legal Probabilism: An Epistemological Dissent” was i rst presented in 2011, at a workshop on standards of proof and scientii c evidence organized by Jordi Ferrer Beltr ? n and his colleagues in the faculty of law at the University of Girona, Spain; and was one of the series of lectures I gave the following year in the faculty of law at the Universidad Externado de Colombia in Bogot ? . It appeared, in Spanish translation by Mar ? a Jos é Viana and Carlos Bernal, in Carmen V ? zquez, ed., Est ? ndares de prueba y preuba cient ? i ca: Ensayos de epistemolog ? a jur ?dica (Barcelona: Marcial Pons, 2013), 65–98. “Irreconcilable Differences? The Troubled Marriage of Science and Law” has proved especially popular since it was i rst presented at a 2007 meeting in Bretton Woods, New Hampshire, organized by David Michaels and his colleagues at the Project on Scientii c Knowledge and Public Policy (SKAPP). In 2008 it was presented in the faculty of law at the University of Alicante,