Robert Dautray  Ignace Robert Dautray, born Kouchelevitz on February 1, 1928 in the 10th arrondissement of Paris, is a French engineer, former scientific director of the French Commissariat à l'Energie Atomique (CEA) and former High Commissioner for Atomic Energy. He is a member of the French Academy of Sciences, section mechanical and computer sciences, and of the French Academy of Technology. Born in France, to a Belarusian father who came to France in 1905 and a Ukrainian mother who came to France in 1902, he escaped the Holocaust during the Second World War. After the war, he prepared as a free candidate for the entrance exam to the École nationale des arts et métiers. He was awarded the top promotion in the promotion that entered Paris in 1945 (Pa45 promotion). On the advice of his professors, he passed the École polytechnique exam in 1949, where he graduated as a major, then joined the CEA/Saclay in the mathematical physics department headed by Jacques Yvon, Jules Horowitz, Albert Messiah, Anatole Abragam, Claude Bloch, Trocheris, etc... Scientific Director of the CEA, he contributes to the development of atomic applications after scientific work on isotopic regulation and the construction of experimental reactors (Grenoble high flux reactor). He is working on the process of separating uranium isotopes. He is the director of the Phébus large laser program. Robert Dautray was High Commissioner for Atomic Energy from 1993 to 1998. Robert Dautray recounted his memories, especially his difficult youth, in his book of Memoirs, published in 2007. Chairman of the Scientific Programs Committee of the National Space Center (CNES). He also addressed the problems of climate change (radiative transfer: greenhouse effect)  Almost all of Robert Dautray's professional activity has been devoted to the physical sciences contributing to nuclear energy, both in reactor physics (reactor control and command, breeder reactor physics, Pegasus research reactors, high-flow reactors from the Von Laue Langevin Institute, etc.) and in the physics of reactors.) and upstream of the fuel cycle (control command of the uranium isotope separation plant) as well as downstream of this cycle (formation and physics of plutonium and other actinides isotopes, descendants of fission products, activated structure nuclei, etc.). In addition, Robert Dautray participated in the establishment of the basic physical sciences for the sciences of high densities and powers of materials and electromagnetic radiation (state equations, opacity, radiative transfer, discontinuities of high velocity flows, interface instabilities, laser implosions, thermonuclear reactions, non-linear neutronics of high velocity media of nuclei making the neutron transport and plasma physics equations non-linear, etc.).