Bayhaqi was born in the village Haares-Abad of Bayhaq in Khorasan Province near Sabzevar. He studied various sciences in Neishabur city, and then he was employed as a clerk in the secretariat of Sultan Mahmud. Abolfazl could show his efficiency there.
In 1039 his master and chief Bu-Nasr Moshkan passed and a few years later King Abd ul-Rashid elected him as the chief of the Royal Secretariat.
After the retirement in 1058, Bayhaqi started the editing of his daily notes and historical data and published them in a book, named it "Tarikh-e Baihaqi".
^An Oriental Samuel Pepys? Abuʾl-Faḍl Bayhaqī's Memoirs of Court Life in Eastern Iran and Afghanistan, 1030-1041, C. Edmund Bosworth, Journal of the Royal Asiatic Society, Third Series, Vol. 14, No. 1 (Apr., 2004), 13.
E.G. Browne. Literary History of Persia. (Four volumes, 2,256 pages, and twenty-five years in the writing). 1998. ISBN 0-7007-0406-X
Jan Rypka, History of Iranian Literature. Reidel Publishing Company. ASIN B-000-6BXVT-K