We regret to announce that since the last issue two members of the Editorial Board have died. Michael Detlefsen (1948 10 20 - 2019 10 21) was a member of the Editorial Board of Philosophia Mathematica, Series III, from its inception. "Mic", as he was known, spent most of his career at the University of Notre Dame, most recently as the McMahon-Hank Professor of Philosophy. He held numerous visiting professorships, including those at the University of Split (Croatia), the Universit?t Konstanz, and several universities in Paris; from 2007-2011 he was Senior Chaire d'Excellence, Agence Nationale de la Recherche, France. Mic worked primarily on the philosophical legacy of Hilbert, Brouwer, and G?del,authoring a long list of journal articles and the book Hilbert's Program (Reidel,1986), and editing the two volumes Proof, Logic and Formalization and Proof and Mathematical Knowledge (both Routledge, 1992).
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