Its success, however, set off a small alarm in Asimov's mind: now Doubleday would never let him stop writing novels. And it never did.
Foundation's Edge
was followed by
The Robots of Dawn
in 1983,
Robots and Empire
in 1985,
Foundation and Earth
in 1986,
Fantastic Voyage II: Destination Brain
in 1987,
Prelude to Foundation
in 1988,
Nemesis
in 1989, and
Forward the Foundation,
published posthumously in 1993. Meanwhile, his
Norby
collaborations with his wife Janet were also appearing, as well as the expansions of his favorite short stories by Robert Silverberg,
Nightfall
in 1990,
The Ugly Little Boy
in 1992, and
The Positronic Man
("The Bicentennial Man") in 1993.