I've got to put Steven Spielberg at the top easily. Band of Brothers, Back to the Future, Schindlers List, Saving Private Ryan, Jurassic Park, Poltergeist, Minority Report, War of the Worlds, Indiana Jones, Munich, A.I., Duel... I could go on and on.
Honorable mentions would go to David Fincher (Seven, Fight Club, Panic Room), Tarantino (Pulp Fiction, From Dusk Till Dawn, Reservoir Dogs, Jackie Brown, Kill Bill), Martin Scorcese (Casino, Taxi Driver, Bringing Out the Dead, Goodfellas, Gangs of New York, Raging Bull), M. Night Shyamalan (Unbreakable, The Sixth Sense, Signs), and of course the man who drew the blueprint for mystery/suspense thrillers... Hitchcock (Rear Window, Vertigo, Rope, The Birds, The Man Who Knew Too Much, Psycho).