Warren Siegel

Warren Siegel (/ˈsiːɡəl/) is a theoretical physicist specializing in supersymmetric quantum field theory and string theory. He is a professor at the C. N. Yang Institute for Theoretical Physics at Stony Brook University in New York.

Siegel did his undergraduate and graduate work at the University of California, Berkeley, graduating with a PhD. in 1977. Following his graduation he worked at several postdoctoral appointments at Harvard (7/77-7/79), Brandeis University (3/79-6/79), the Institute for Advanced Study (8/79-8/80), Caltech (8/80-8/82) and University of California, Berkeley (8/82-8/85). He served as an assistant professor at the University of Maryland, College Park from 1985-1987 before becoming a professor at Stony Brook University in 1987.

His early work involved the use of superspace to treat supersymmetric theories, including supergravity. Along with S.J. Gates, M.T. Grisaru, and M. Rocek he discovered methods for both deriving classical actions, and performing Feynman graph calculations more simply than those in nonsupersymmetric theories. He discovered a new version of dimensional regularization ("dimensional reduction") which preserves supersymmetry, and is also commonly used in quantum chromodynamics (QCD). The first supersymmetric nonrenormalization theorem was introduced by Grisaru, Siegel and Rocek in their 1979 paper "Improved methods for supergraphs", which has close to 700 citations.

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