Leonid Keldysh

Leonid Keldysh was one of the most influential theoretical physicists of the twentieth century, giving his name to the Keldysh nonequilibrium (real-time) formalism, the Franz–Keldysh effect, and Keldysh theory of strong-field ionization; he also predicted excitonic Bose–Einstein condensation. He worked for decades at the Lebedev Physical Institute in Moscow. His documented family — including his mother, mathematician Lyudmila Keldysh — is described in biographies as Russian, and no Jewish heritage is documented; he appears in Jewish reference listings of physicists.