Before 1930.
A Presbyterian minister, McCook was living in Philadelphia, Pennsylvania, as of 1870. On Columbus Day, 1892, McCook delivered the benediction at ceremonies marking the World Columbian Exposition, Chicago, Illinois. McCook’s prayer followed remarks by (amongst others) Levi Parsons Morton, twenty-second Vice President of the United States. In 1906, 1910, and 1920, McCook was living in Devon, Pennsylvania.