Autor: Paul A. Johnson

Both authors are pioneers in the recent developments on theoretical and experimental approaches in the field of nonlinear elasiticity and its application in NDT. They are both internationally recognized and very active in the international research community. From a review: „Guyer has the broadest awareness of new theoretical methods in this field of anyone I have met, and Johnson has either done, supervised, or collaborated on a large fraction of the experiments reported here.“(from a review) Dr. Paul A. Johnson is Senior Technical Staff Member of the Geophysics Group at Los Alamos National Laboratory and Chief of Project of the Nonlinear Elasticity Group. Studied Geophysics at the University of Arizona and Geology at the University of New Mexico. Got his Ph.Din Solid Mechanics from the Université Pierre et Marie Curie, Paris. Publications in several journals, among others Materials World, Physics today, Nature, and Science (in review). Prof. Robert A. Guyer graduated in Physics at the New Mexico State University and got a Ph D at Cornell University. Full Professor of Physics at the University of Massachusetts. His recent work on the dynamical behaviour of granular materials has been published in established journals like Phys.Rev.Lett., Phys.Rev. B, Journal of the Acoustical Society of America, and Geophysical Research Letters.