Wolfgang Köhler (1887–1967) German-American psychologist and phenomenologist
Source: Dynamics in Psychology, 1940, p. 116
As quoted in The Century: A Popular Quarterly (1874) ed. Richard Watson Gilder, Vol. 7, pp. 508-509, https://books.google.com/books?id=ceYGAQAAIAAJ&pg=PA508 "Relations of Mathematics to Physics". Earlier quote without citation in Nature, Volume 8 (1873), page 450. <br class="br">Also quoted partially in Michael Grossman and Robert Katz, Calculus http://babel.hathitrust.org/cgi/mb?a=listis;c=216746186|Non-Newtonian (1972) p. iv. ISBN 0912938013.
Wolfgang Köhler (1887–1967) German-American psychologist and phenomenologist
Source: Dynamics in Psychology, 1940, p. 116
Mark Kac (1914–1984) Polish-American mathematician
Source: Enigmas Of Chance (1985), Chapter 2, Lwów, p. 39.
Hans Freudenthal (1905–1990) Dutch mathematician
Source: The Concept and the Role of the Model in Mathematics and Natural and Social Sciences (1961), p. ix
W. V. D. Hodge (1903–1975) British mathematician
W. V. D. Hodge, Changing Views of Geometry. Presidential Address to the Mathematical Association, 14th April, 1955, The Mathematical Gazette 39 (329) (1955), 177-183.
George Frederick James Temple (1901–1992) British mathematician
100 Years of Mathematics: a Personal Viewpoint (1981)
Marcus du Sautoy (1965) British professor of mathematics
Conclusion in BBC's The Story of Maths, episode 4
Richard Courant (1888–1972) German American mathematician (1888-1972)
Richard Courant in: The Parsimonious Universe, Stefan Hildebrandt & Anthony Tromba, Springer-Verlag, 1996, page 148
Freeman Dyson (1923) theoretical physicist and mathematician
Selected Papers of Freeman Dyson with Commentary. https://books.google.com/books?id=nnyNUidX1OMC&pg=PA1 American Mathematical Soc. (1996) p. 1