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George Hervey Hallett Jr. (1895–1985) was a civic activist and avid birder. As head of Citizens Union, a municipal watchdog group, he led the revision of the New York City Charter that was adopted by voters in 1975.
Hallett was born in 1895 to a Quaker family in Philadelphia, Pennsylvania. He attended Haverford College, received a master's degree in mathematics from Harvard University and a PhD from Pennsylvania University. He was a conscientious objector during World War I. Hallett was a prominent advocate of proportional representation in politics.
The Hallett Nature Sanctuary in the southern end of New York City's Central Park was dedicated to his memory on June 30, 1986.