Irving Segal
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Irving Ezra Segal (1918–1998) was a mathematician known for work on theoretical quantum mechanics.
He was at the Massachusetts Institute of Technology. He shares credit for what is often referred to as the Segal-Shale-Weil distribution.
Irving Segal created the chronometric theory.
Obituary in Americal Mathematical Society Notices: http://www.ams.org/notices/199906/mem-segal.pdf