Samuel Beckett -- Known most for the play Waiting For Godot, but I love his earlier novels such as Murphy and Malone Dies.
Thomas Pynchon -- Just for the magnificence of Gravity's Rainbow, an insane masterpiece.
Thomas McGuane -- The Bushwhacked Piano is my favorite.
T. Coraghesian Boyle -- A fantastic storyteller.
Anne Tyler -- The Accidental Tourist was made into a movie.
John Barth -- Another truly fantastic storyteller -- think Giles Goat Boy and The Sot Weed Factor.
Vladimir Nabokov - One of the most original stylists in the English language ever. It wasn't even his first (Russian) or his second (French) language. Brilliant!
Dom DeLillo -- Read White Noise. It's short, and hilarious.
Tom Stoppard -- Rosencrantz and Guildenstern Are Dead is my favorite play ever, even beating out Waiting For Godot, which is considered the best English language play of the 20th century and won Beckett the Nobel Prize for literature.
Louise Erdrch -- Read The Beet Queen.
Carolyn Chute -- Doesn't belong in the top tier, but I LOVED The Beans of Egypt, Maine!
William Faulkner -- Can't not list him.
Paul Theroux -- Yet another great storyteller.
^^^ These are just a few off the top of my head, and are not in any particular order. There are so many others.