L. Ron Hubbard

Fiction: Battlefield Earth, Fear and the Mission Earth Series



Nonfiction: Dianetics, Self Analysis and Science of Survival

Orson Scott Card

Ender's Game and the entire series, the Alvin Series and almost everything he writes.

Michael Crichton

Sphere, Prey, State of Fear and others



Also check out his lecture, "Complexity Theory and Environmental Management."

Jim Marrs

Rule by Secrecy and the rest

Terry Goodkind

Wizard's First Rule and the entire series

E. E. (Doc) Smith

The Lensman Series

Laurell K. Hamilton

The Anita Blake Vampire Series

Douglas Adams

The Hitchhiker's Guide and all the rest.

David Brin

Earth and The Postman particularly.

Larry Niven & Jerry Pournelle

Lucifer's Hammer, A Mote in God's Eye, The Gripping Hand, Fallen Angels,
Oath of Fealty, The Legacy of Heorot and many more.