Originally published in the pulps, the foundation trilogy was based on the Rise and Fall of the Roman Empire timeline. Written when Asimov was but a callow youth, it isn't great literature, but it is a seminal work and a must-read for any science fiction fan.

The Old Empire is crumbling and Hari Seldon and his psychologists work to create the Foundation, dedicated to art, science and technology to be the nucleus of the next foundation, predicted to rise after the dark ages to come. Seldon believed that his work could considerably shorten the years of decay and barbarism to come.

Originally two stories, published in 1945, this become the second part of one of the great SF trilogies. In the tradition of SF trilogies, of course, it went on ...

Hari's predictions are holding true until they encounter what cannot be predicted -- a mutation.

Originally two stories published in 1948 and 1949 this volume .

The mystery continues, if Hari Seldon set up two Foundations, where is the second colony?

Unlike the earlier novels, this is a great thumping book. This is the first book that Asimov wrote in which he brought together the Robots and the Foundation and Empire.

The Eternals, who adjusted human history appear in The End of Eternity which doesn't conform to this chronology.

The fifth Foundation novel if you count the prequel (Asimov did), my copy announces that it is the fourth, based on publishing dates.

The search is on for the legendary planet, Earth. In Asimov's universe, humans will only grow if they leave the Earth, and that may require it's destruction. Of course, Asimov was afraid of flying, as you can tell from some of his writing, and catastrophe would probably have been necessary to get him into the air, much less space. (Another famous SF person afraid of flying was Stanley Kubrick).

Hari Seldon, struggles with his greatest work on psychohistory in the fading light of a doomed empire.

Although this book is placed chronologically between 5 and 6, it is best read last.

A collection of Asimov's probably 20 best short stories.

36 short stories and essays