Constantin Piron (1932, Paris - 9 May 2012, Lausanne) was a Belgian physicist[1] who worked for most of his career in Switzerland.
[2] In 1963 Piron earned his doctor of science degree from the University of Lausanne under the direction of Ernst Stueckelberg and Josef-Maria Jauch with a thesis on quantum logic, "Axiomatique quantique".
He developed Jauch's methods (called the Geneva approach) for the foundations of quantum mechanics.
Piron's Theorem (1964)[3] is a famous representation theorem for quantum lattices.
He was appointed assistant professor in the physics department of the University of Geneva in 1969 and professor ordinarius in 1974.