William Prager

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William Prager (May 23, 1903 in Karlsruhe – March 16, 1980 in Zurich) was a German-born US applied mathematician. In the field of mechanics he is well known for the Drucker–Prager yield criterion.

He was a lecturer at Darmstadt, a deputy director at University of Göttingen, professor at Karlsruhe, University of Istanbul, the University of California, San Diego and Brown University, where he advised Bernard Budiansky. Prager was also on a sabbatical at IBM's research lab in Zurich.[1]

The Society of Engineering Science has awarded the William Prager Medal in Solid Mechanics since 1983 in his honor.[2]


  • Beitrag zur Kinematik des Raumfachwerks, 1926, dissertation
  • "Dynamik der Stabwerke" (with K. Hohenemser), 1933
  • "Mechanique des solides isotropes", 1937
  • Prager, William; Hodge, Philip G, Jr. (1951). Theory of Perfectly Plastic Solids. John Wiley & Sons. LCCN 51-012695.
  • Prager, William (1961). Introduction to Mechanics of Continua. Ginn and Company.

External links[edit]


  1. ^ Speiser, Ambros (1988). "IBM Research Laboratory Zurich: The Early Years". IEEE Annals of the History of Computing. 20. doi:10.1109/85.646205.
  2. ^ William Prager Medal