| Leonid Keldysh | |
| Native Name: | Леонид Келдыш |
| Native Name Lang: | ru |
| Birth Name: | Leonid Veniaminovich Keldysh |
| Birth Date: | 7 April 1931 |
| Birth Place: | Moscow, RSFSR, Soviet Union |
| Death Place: | Moscow, Russia |
| Citizenship: | Russian |
| Fields: | Theoretical physics |
| Workplaces: | Lebedev Physical Institute |
| Academic Advisors: | Vitaly Ginzburg |
| Doctoral Students: | Yuri Kopaev |
| Known For: | Keldysh formalism Franz–Keldysh effect |
| Awards: | EPS Europhysics Prize [1] Rusnanoprize (2009) Lomonosov Gold Medal (2015) |
| Spouses: | )--> |
| Mother: | Lyudmila Keldysh |
| Relatives: | Pyotr Novikov (step-father) Mstislav Keldysh (uncle)Sergei Novikov (step-brother) |
| Partners: | )--> |
Leonid Veniaminovich Keldysh (; 7 April 1931 – 11 November 2016) was a Soviet and Russian physicist. Keldysh was a professor in the I.E. Tamm Theory division of the Lebedev Physical Institute of the Russian Academy of Sciences in Moscow and a faculty member at Texas A&M University. He is known for developing the Keldysh formalism,[2] a powerful quantum field theory framework designed to describe a system in a non-equilibrium state, as well as for the theory of excitonic insulators (Keldysh-Kopaev model, with Yuri Kopaev).[3] Keldysh's awards include the 2009 Rusnanoprize, an international nanotechnology award, for his work related to molecular-beam epitaxy,[4] the 2011 Evgenii Feinberg Memorial Medal, and the 2015 Lomonosov Grand Gold Medal of the Russian Academy of Sciences.[5]
Keldysh was a son of mathematician Lyudmila Keldysh. His uncle, Mstislav Keldysh, was a mathematician and the president of the Academy of Sciences of the Soviet Union. Sergei Novikov, a mathematician and a Fields medalist, is his step-brother.[6]