Hesiod and Homer are together the two sole sources of early Greek epic poetry. Two genuine works of his survive today, Works and Days and Theogeny.
He lived circa 700 BC. In the Theogeny, he tells us a little bit about his life. His father gave up on his trade of being a fisherman, moved from Asia Minor to Boeotia, and became a farmer. One day while tending sheep, Hesiod was visited by the Muses, who told him to become a poet.
Hesiod is the first great source on Greek mythology, and is relied on extensively in this web.
Oxford Concise Companion to Classical Literature. ed. Howatson and Chilvers. Oxford. New York, 1993.