Robert J. Silbey

Robert James Silbey (October 19, 1940 – October 27, 2011) was an American theoretical chemist at the Massachusetts Institute of Technology (MIT). His research focused on the theory of electronic processes in condensed phases, including energy and electron transfer, exciton dynamics, and the optical properties of molecular systems. He was elected to the National Academy of Sciences in 2003.

Early life and education Silbey was born in Brooklyn, New York, the son of Sidney and Estelle Silbey. He attended public schools in New York City and earned a bachelor's degree from Brooklyn College in 1961.

His research addressed theoretical problems in condensed-phase chemistry, often in close interaction with experimental work. He made contributions to the theory of electronic excitation in molecular crystals, energy transfer processes, and the interaction of electronic and vibrational degrees of freedom in condensed systems. He later extended this work to exciton–phonon coupling and energy transfer in disordered systems and molecular aggregates.

He also contributed to the theory of conjugated polymers, including calculations of electronic structure and optical properties, and analyses of nonlinear optical behavior in such materials. His work on single-molecule spectroscopy addressed fluctuations, line shapes, and photon emission dynamics in condensed environments.

Teaching and administration Silbey was known at MIT for undergraduate and graduate teaching in physical chemistry.

As an administrator, he served as dean of the School of Science during a period that included new faculty initiatives and construction projects. He was also a fellow of the American Academy of Arts and Sciences (elected 1991) , the American Association for the Advancement of Science, and the American Physical Society (elected 1980).

His awards included the Max Planck Research Award and the J. O. Hirschfelder Prize in Theoretical Chemistry. Personal life Silbey was married to sociologist Susan Silbey and had two daughters. He died on October 27, 2011, in Cambridge, Massachusetts.