Contracted AIDS from a blood transfusion during a triple bypass heart surgery.

From About the Author in Robots of Dawn (1983):

Isaac Asimov was born in the Soviet Union to his great surprise.  He moved quickly to correct the situation.  When his parents emigrated to the United States, Isaac (three years old at the time) stowed away in their baggage.  He has been an American citizen since the age of eight.

Brought up in Brooklyn, and educated in its public schools, he eventually found his way to Columbia University and, over the protests of the school administration, managed to annex a series of degrees in chemistry, up to and including a Ph.D.  He then infiltrated Boston University and climbed the academic ladder, ignoring all cries of outrage, until he found himself Professor of Biochemistry.

Meanwhile, at the age of nine, he found the love of his life (in the inanimate sense) when he discovered his first science-fiction magazine.  By the time he was eleven, he began to write stories, and at eighteen, he actually worked up the nerve to submit one.  It was rejected.  After four long months of tribulation and suffering, he sold his first story and, thereafter, he never looked back.

In 1941, when he was twenty-one years old, he wrote the classic short story "Nightfall" and his future was assured.  Shortly before that he had begun writing his robot stories, and shortly after that he had begun his Foundation series.

What was left except quantity?  At the present time, he has published over 260 books, distributed through every major division of the Dewey system of library classification, and shows no signs of slowing up.  He remains as youthful, as lively, and as lovable as ever, and grows more handsome with each year.  You can be sure that this is so since he has written this little essay himself and his devotion to absolute objectivity is notorious.

He is married to Janet Jeppson, psychiatrist and writer, has two children by a previous marriage, and lives in New York City.