SUSPENSE

1- Who's the director of this movie Psycho?
Alfred  Hitchcock 
2- What type of characters did he often use in horror films?

Hitchcock's frequent exploration of the thin line between sanity and madness - in films like Spellbound (1944), Rope (1948), Strangers on a Train (1951), Vertigo (1958) and Marnie (1964) - and their stories Of serial killers - The Lodger (1926), Psycho (1960), and Frenzy (1972) - paved a direct path to contemporary horror films.

3- What technique did he use with the camera?

Hitchcock portrayed terror in exposing the killer's psyche. Perhaps Hitchcock's most important contribution to horror films was his frequent use of the camera to reveal the vision of a character, as in Psycho when Norman Bates peeks through a hole in Marion, or when "Mother" hits Marion in the shower.