Isaac Minis Hays was born on July 26, 1847, in Philadelphia, Pennsylvania.

He was a physician, ophthalmologist, editor, author, and librarian. He graduated from the University of Pennsylvania (A.B., 1866; M.D., 1868; M.A., 1869). Hays wrote or edited several works in his field of ophthalmology, including the American edition of J. Soelberg Wells’ Treatise on the Diseases of the Eye (1873) and a statistical survey entitled “Blindness: Its Frequency, Causes and Prevention” for William F. Norris and Charles A. Oliver’s System of Diseases of the Eye (1897). In 1878, he succeeded his father as editor of the American Journal of Medical Sciences and several years later, he converted a sister publication of the Journal, the monthly Medical News and Library, to a weekly format. In 1872, he was elected a Fellow of the College of Physicians of Philadelphia. In 1873, he was appointed to the Library Committee of the College and pursued its work with creativity and energy. In 1886, he was elected to membership in the American Philosophical Society (APS) and served as its librarian from 1897 until his retirement in 1922. He purchased a card catalogue and hired a professional cataloger. For a library cataloging system, Hays adopted the Dewey Decimal Classification system to replace the “philosophical” classification of former APS Librarian J. Peter Lesley (1819-1903). He sent the neglected books for binding, sold duplicate volumes, and withdrew books outside the library’s fields of interest. One of his most impressive accomplishments was a fifteen-year project to bind and catalogue the papers of Benjamin Franklin.

In 1873, he married Emma Wood (1847–1916). He died on June 5, 1925, in Philadelphia, Pennsylvania.

John Haywood was born on March 16, 1825, in Stockton, Chautauqua, New York.
He was a professor, amateur astronomer, and inventor. He graduated from Oberlin College, Ohio in 1850 and began teaching mathematics and natural sciences at Otterbein University in 1851. He surveyed the streets of Westerville and became the first mayor when the village was incorporated in 1858, but only served until the spring election of 1858. Haywood kept the official records on the weather conditions in the Westerville vicinity including temperature, rainfall, barometric pressure, wind velocity, and humidity. He also introduced the metric system to the area and provided meters for measuring cloth to local merchants to encourage its adoption. He was also a keen amateur astronomer and the inventor of the tangent index. After his retirement, he was known as the "Grand Old Man of Otterbein."
In 1852, he married Sylvia Carpenter (1828–1886) and in 1888, he remarried Eliza A. Carpenter (1833–1909). He died on December 12, 1906, in Westerville, Franklin County, Ohio.