He definitely is one of my favorite authors. I mostly read his science-fiction novels, but thats not what he only wrote. There is a FAQ available at http://www.clark.net/pub/edseiler/WWW/asimov_FAQ.html.
Here is a short bio of him
The following is a readers guide for the robot, empire and foundation series which are actually all related. They were not printed in this order, but this is how it should be read.Asimov was born in Petrovichi, near Smolensk, Russia, on Jan. 2, 1920. He moved to the United States with his family in 1923 and became an American citizen in 1928. He earned degrees in chemistry at Columbia University between 1939 and 1948. He later taught biochemistry at the Boston University School of Medicine, resigning his position in 1958 to devote all his time to writing. As with his science fiction, Asimov' s nonfiction reflects a nurturing personality dedicated to reason and knowledge and deeply concerned about humanity's future. Asimov was a co-editor of many science fiction anthologies and was editorial director of Isaac Asimov's Science Fiction Magazine, founded in 1977. He died in New York City on Apr. 6, 1992. 
0) "The Complete Robot" ( not a must but a good place to start)
1) "Bicentennial Man" ( not a must)
2) "The Caves of Steel" ( start of the Robot novels)
3) "The Naked Sun"
4) "The Robots of Dawn"
5) "Robots and Empire" (last of the Robot novels)
6) "The Currents of Space" (first Empire novel)
7) "The Stars, Like Dust ..."
8) "Pebble in the Sky" (last Empire novel)
9) "Prelude to the Foundation" ( First in the Foundation series)
10) "Foundation"
11) "Foundation and Empire"
12) "Second Foundation"
13) "Foundation's edge"
14) "Foundation and Earth" ( Last in the Foundation series)