Hitchcock, the suspense's creator
In the long, wonderful and irreplaceable interview that Francois Truffaut made him in 1962, Hitchcock explained with exemplary simplicity and directness the difference between fear and suspense: we put that in one scene there are men sitting at a table and playing cards. Under the table there's a bomb but the public doesn't know this. At one point, the bomb explodes and the crowd jumps with fright. But the shock is short. In the same situation, we put that the public knows the danger that threatens those men who, busy on a futile game of poker, are unaware of running a terrible risk. When the bomb will burst the shock will be less but the viewer will have accumulated many tense minutes.The Hitchcock's key, in the end, consists in involving the public. And, in fact, we always identify ourselves with Jim Stewart when he spies his neighbours in "Rear window", or we feel, on the millionth vision, the same terrible fear in the famous shower scene in "Psycho". Janet Leigh has a wash, and although we know how it ends, you want to make her a whistle and inform her that she can think of hygiene in another moment because nearby there's a psychopathic that is going to torture her with stabs.
There are few directors who can say to be his purebred followers, although many have tried to emulate him.