Robert ("Bob") Zwanzig died onMay 15 this year at the age of 86. He had been a member of the National Academy of Sciences since 1972. He is survived by Frances, his wife of 60 years, a daughter, Elizabeth Bennett, and a son, Carl. Frances writes that Bob "was a baker of bread and of made-from-scratch pizza, a maker of dry martinis and hearty soups, an ice dancer, and a walker along the Chesapeake and Ohio Canal." We remember Bob as the theorist who inspired us, sometimes criticized us, and more than anyone else, explained the foundations of nonequilibrium statistical mechanics.
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