a biographer.

A writer of biography, esp. the author of a biography of a particular person. Occasionally in figurative or extended use.

= biographer, n.

In early use: a person who writes biographical history. In later use: a person who studies human life and character. Cf. biology, n. 1. Obsolete.

A writer of biographical or historical memorials, a memoirist. Also (occasionally) as adj.

Used allusively for: a constant companion or attendant who witnesses and records what a person does.