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Mangasar Magurditch Mangasarian (December 29, 1859–June 26, 1943) was an American rationalist and secularist of Armenian descent.
Born in Mashger (now within Turkey) in the Ottoman Empire, he attended Robert College in Constantinople, and was ordained as minister in Marsovan in 1878. In about 1880 he enrolled at Princeton University. He was pastor at a Presbyterian church in Philadelphia from 1882 to 1885, when he resigned, becoming an independent preacher and a lecturer on "independent religion" in New York.