historian

n. one who studies history; one who has written a work of history

A historian is an individual who studies history and who writes on history. The person may be an authority (or expert) over history, but this is not a requirement. Most generally, historians are the writers, compilers and narrators of history. Historians are concerned with the continuous, systematic narrative and research of past events as relating to the human race; as well as the study of all events in time. If the individual is concerned with events preceding written history, the individual is a historian of prehistory. Although "historian" can be used to describe amateur and professional historians alike, it is reserved more recently for those who have acquired graduate degrees in the discipline. Some historians, though, are recognized by equivalent training and experience in the field. Historian became a professional occupation in the late nineteenth century at roughly the same time that physicians also set standards for who could enter the field. The professional association of historians in the United States is the American Historical Association, founded in 1884.
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Noun
1. a person who is an authority on history and who studies it and writes about it
(synonym) historiographer
(hypernym) scholar, scholarly person, student
(hyponym) annalist
(classification) history

v. chronicle, record, write down (historical or other events)

(n.)
One versed or well informed in history.
  

(n.)
A writer of history; a chronicler; an annalist.