Mark Kurlansky (non fiction) I think "Salt" is his best
Neal Stephenson (fiction, speculative)
Robert Heinlein (fiction, sci-fi)
James Crumley (fiction, hard boiled)
James A. Michener (fiction, historic)
"The Forever War" Joe Haldeman
"Old Man's War" John Scalzi
"Moveable Feats The History, Science, and Lore of Food" Gregory McNamee
"Botany of Desire" Michael Pollan
"Ishamael" Daniel Quinn