Oh man, as I warned my taste is all over the place.
Fantasy: Neil Gaiman (Neverwhere, Stardust, American Gods), Kevin Hearne (Iron Druid Chronicles series, especially Audiobooks the voice talent is amazing), Patrick Rothfuss (The Kingkiller Chronicle series) and the Harry Potter Series as well as Game of Thrones, but they are pretty popular so you've likely heard of them
Horror: Brian Keene (The Rising), F. Paul Wilson (The Keep), Simon Clark (Stranger, Vampyrrhic)
Suspense/Thriller: Gillian Flynn (Gone Girl, Dark Place, Sharp Objects), Paula Hawkins (The Girl on the Train, Into the Water), Dan Brown (the Robert Langdon series)
Gen. Fiction: Edward Carey (Observatory Mansion), Harper Lee (To Kill a Mockingbird), Christopher Priest (The Prestige), Chuck Palahniuk (not for everyone, he's graphic in his writing Fight Club, Choke, Survivor are my top 3)
Non-Fiction: Chris Kyle (American Sniper), Truman Capote (In Cold Blood), Frank Abagnale (Catch Me if You Can), Christopher McDougall (Born to Run)
Sci-Fi: William Gibson (Neuromancer), Mike Resnick (Santiago), Ernest Cline (Ready Player One, Armada)
Just a few I really enjoyed