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J. Peter Lesley, or J. P. Lesley (1819-1903), geologist; graduated U. of Pennsylvania in 1838; joined Pennsylvania Geological Survey (dirctor: Henry Darwin Rogers), continuing to work with them on and off for years; studied for the ministry at Princeton Theological Seminary 1841, then in Europe 1844; minister of Congregational Church in Pa. then in Milton, Massachusetts; married Susan Inches Lyman in 1849; associated with progressives like Lydia Maria Child, James Freeman Clarke, Thomas Wentworth Higginson. In 1852, left the Geological Survey and the ministry, and moved to Pennsylvania. "Employed by the Pennsylvania Railroad Company and other corporations, Lesley was an important cartographer ... an important writer and synthesizer of knowledge about the coal and iron regions ... " Elected to the American Philosophical Society in 1856, and served as its librarian (1858-1885), secretary (1859-1887), and vice president (1887-1898). Hired by University of Pennsylvania as Professor of Mining in 1859; "later became Professor of Geology and Mining Engineering and Dean of the Science Faculty, and in 1875, he was appointed Dean of the newly formed Towne Scientific School." Director of Pennsylvania state Geological Survey, 1874 to 1889. Daughters: Margaret Lesley Bush-Brown (1857-1944), and Mary Lesley Ames [1853-1929] who married Charles W. Ames (1855-1921)

"Although baptized 'Peter Lesley,' like his forebears, our protagonist is known to the geological world as 'J. P. Lesley,' because about 1850 he prefixed the letter J. to indicate 'junior,' and abbreviated Peter, a name that he did not then like, to its initial. In later years he came to prefer his baptismal name. His varying usage might well confuse the unwary reader: the first report of the Second Geological Survey of Pennsylvania bears the name of J. P. Lesley on the title page; in the list of officers the state geologist is given as Peter Lesley, and in a sketch of survey history one of the early workers is named Peter Lesley, Jr.; but these three names all refer to one individual." (NATIONAL ACADEMY OF SCIENCES BIOGRAPHICAL MEMOIRS, W. M. DAVIS, June 1915)

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