Mario S. De Pillis (January 22, 1926, in Philadelphia, Pennsylvania[1] – November 18, 2021) was an emeritus professor of American Religious history at the University of Massachusetts Amherst.
De Pillis specialized in the history of such groups as the Latter-day Saints and Shakers.
He was the second president of the Mormon History Association who was not a member of The Church of Jesus Christ of Latter-day Saints, any other Latter-day Saint movement church, or a former member of any such church.
De Pillis and his wife, the former Freda M. Rustemeyer, were the parents of three sons.
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