John Tanton/Definition
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Retired ophthalmologist; active in natural conservation, which led him to consider population issues; Original founder and board of directors member of Federation for American Immigration Reform; national President of Zero Population Growth from 1975 to 1977 and was Chairman of its Immigration Study Committee (1973-1975); Chairman of the Sierra Club National Population Committee (1971-1975). Past and current publisher of The Social Contract; accused by the Southern Poverty Law Center of being at the heart of white nationalist movements