Writing an intellectual biography of Richard Posner is a formidable task. Becoming acquainted with his output alone means getting through over 3000 of Posner's judicial opinions, reading more than fifty of his books, and about five hundred scholarly papers. William Dominarski took up the gauntlet and has written the first full-length biography of the 77-year old Promethean of Law and Economics. The book is available here. Some (somewhat mixed) reviews here and here.
An interview with the author here.