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Also see [ Railway Officials in America 1906
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Cooley, Mark O., was born at Canandaigua, N. Y., December 25, 1861, and was a son of Nathaniel N. Cooley, a
farmer of that place, now deceased. Mr. Cooley was educated in the Canandaigua Academy and at the age of seventeen
returned to the homestead farm, where he tilled the soil. From 1882 until 1885 he studied dentistry in the office
with C. J. Andruss of Cauandaigua, at which time he went to Philadelphia, Pa., where he completed a two years'
course in the Philadelphia Dental College and was graduated in 1887. In the same year he came to Niagara Falls,
where he has since had a large and successful practice in dentistry.
Landmarks of Niagara County, New York
Edited by William Pool
D. Mason & Company, Publishers, 1897