Carl Gustav Hempel

Hempel studied mathematics, physics and philosophy at the University of Göttingen and subsequently at the University of Berlin and the Heidelberg University. In Göttingen, he encountered David Hilbert and was impressed by his program attempting to base all mathematics on solid logical foundations derived from a limited number of axioms.

After moving to Berlin, Hempel participated in a congress on scientific philosophy in 1929 where he met Rudolf Carnap and became involved in the Berlin Circle of philosophers associated with the Vienna Circle. In 1934, he received his doctoral degree from the University of Berlin with a dissertation on probability theory, titled Beiträge zur logischen Analyse des Wahrscheinlichkeitsbegriffs (Contributions to the Logical Analysis of the Concept of Probability). Hans Reichenbach was Hempel's main doctoral supervisor, but after Reichenbach lost his philosophy chair in Berlin in 1933, Wolfgang Köhler and Nicolai Hartmann became the official supervisors.[6]

Within a year of completing his doctorate, the increasingly repressive and anti-semitic Nazi regime in Germany had prompted Hempel to emigrate to Belgium as his wife was of Jewish ancestry.[7] In this he was aided by the scientist Paul Oppenheim, with whom he co-authored the book Der Typusbegriff im Lichte der neuen Logik on typology and logic in 1936. In 1937, Hempel emigrated to the United States, where he accepted a position as Carnap's assistant[8] at the University of Chicago. He later held positions at the City College of New York (1939–1948), Yale University (1948–1955) and Princeton University, where he taught alongside Thomas Kuhn and remained until made emeritus in 1973. Between 1974 and 1976, he was an emeritus at the Hebrew University in Jerusalem before becoming University Professor of Philosophy at the University of Pittsburgh in 1977 and teaching there until 1985. In 1989 the Department of Philosophy at Princeton University renamed its Three Lecture Series the 'Carl G. Hempel Lectures' in his honor.[9] He was an elected member of the American Academy of Arts and Sciences[10] and of the American Philosophical Society for which he served as president.[11]

Hempel never embraced the term "logical positivism" as an accurate description of the Vienna Circle and Berlin Group, preferring to describe those philosophers, including himself, as "logical empiricists." He believed that the term "positivism," with its roots in the materialism of Auguste Comte, implied a metaphysics that empiricists were not obliged to embrace. He regarded Ludwig Wittgenstein as a philosopher with a genius for stating philosophical insights in striking and memorable language, but believed that he, or at least the Wittgenstein of the Tractatus, made claims that could only be supported by recourse to metaphysics. To Hempel, metaphysics involved claims to know things which were not knowable; that is, metaphysical hypotheses were incapable of confirmation or disconfirmation by evidence.

Hempel is also credited with the revival of the Deductive-nomological model of explanation in the 1940's with the publication of "The function of general laws in history".[12]

In 2005, the City of Oranienburg, Hempel's birthplace, renamed one of its streets "Carl-Gustav-Hempel-Straße" in his memory.

• Holt, Jim, "Positive Thinking" (review of Karl Sigmund, Exact Thinking in Demented Times: The Vienna Circle and the Epic Quest for the Foundations of Science, Basic Books, 449 pp.), The New York Review of Books, vol. LXIV, no. 20 (21 December 2017), pp. 74–76.

• Carl Gustav Hempel at the Internet Encyclopedia of Philosophy.
• "Problems and Changes in the Empiricist Criterion of Meaning" by Carl G. Hempel
• Obituary by the Princeton University Office of Communications.
• Carl Gustav Hempel Papers, 1903-1997, ASP.1999.01 at the Archives of Scientific Philosophy, Special Collections Department, University of Pittsburgh.
• Obituary in the New York Times.