Leonard Salomon Ornstein

Leonard Salomon Ornstein (November 12, 1880, Nijmegen, The Netherlands — May 20, 1941, Utrecht, The Netherlands) was a Dutch physicist. He studied theoretical physics with Hendrik Antoon Lorentz at University of Leiden. He subsequently carried out Ph.D. research under the supervision of Lorentz, concerning an application of the statistical mechanics of Gibbs to molecular problems. In 1914 he was appointed professor of physics, as successor of Pet... more

Leonard Salomon Ornstein (November 12, 1880, Nijmegen, The Netherlands — May 20, 1941, Utrecht, The Netherlands) was a Dutch physicist. He studied theoretical physics with Hendrik Antoon Lorentz at University of Leiden. He subsequently carried out Ph.D. research under the supervision of Lorentz, concerning an application of the statistical mechanics of Gibbs to molecular problems. In 1914 he was appointed professor of physics, as successor of Peter Debye, at University of Utrecht. In 1922 he became director of Physical Laboratory (Fysisch Laboratorium) and extended his research interests to experimental subjects. His measurements concerning intensities of spectral lines brought Physical Laboratory in the international limelight. He is also remembered for the Ornstein-Zernike theory (named after Ornstein and Frederik Zernike) concerning correlation functions. Together with Gilles Holst, director of Philips Research Laboratories (Philips Natuurkundig Laboratorium), he was the driving... less