Isaac Asimov began his Foundation series at the age of 21, not realizing that it would one day be considered a cornerstone of science fiction. During his legendary career, Asimov penned over 400 books on subjects ranging from science to Shakespeare to history, though he was most loved for his award-winning science fiction sagas. Asimov entertained and educated readers of all ages for close to five decades, until he died, at the age of 72, in April 1992.