John Langdon Sibley

John Langdon Sibley (29 December 1804 – 9 December 1885) was the librarian of Harvard University from 1856 to 1877.

Sibley was the son of Dr. Jonathan Sibley and his wife, née Persis Morse. He received his undergraduate education at Harvard and then studied at Harvard Divinity School. From 1829-1833 he was a pastor in Stow, Massachusetts. He then went to Cambridge, Massachusetts where he worked as a magazine editor. When Harvard's first purpose-built library building, Gore Hall, was opened in 1841, he was appointed the assistant librarian under Thaddeus William Harris. In 1856 when Harris died Sibley became the librarian of Harvard.

On 30 May 1866, Sibley married Charlotte Augusta Langdon Cook, at Sommerville, Massachusetts.

Sibley oversaw both the physical and fiscal expansion of the Harvard Library. He also compiled the initial volumes of Sibley's Harvard Graduates series (three volumes published between 1873 and 1885 covering the classes of 1642 to 1689) and bequeathed funds to the Massachusetts Historical Society for continuation of this project. This task was undertaken by Clifford K. Shipton who covered the classes of 1690 to 1771 in 14 Volumes from 1932 to 1975, and in 1999 an 18th volume appeared covering classes from 1772 to 1774.

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