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Joshua Lederberg[lA´durbUrg´´] Pronunciation Key, 1925–, American geneticist, b. Montclair, N.J., grad. Columbia, 1944, Ph.D. Yale, 1948. He is known for his studies of the genetic mechanisms of bacteria. He shared with G. W. Beadle and E. L. Tatum the 1958 Nobel Prize in Physiology or Medicine for establishing that sexual recombination occurs in bacteria. Lederberg showed that although bacteria reproduce only by dividing, they are able to effect sexual recombination by processes that result in exchange of genetic material between different bacteria. In 1978, he joined Rockefeller Univ.; where he served as president until 1990.
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