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Cahiers du Cinéma

Over the next few years, Truffaut became a critic (and later editor) at Cahiers, where he became notorious for his brutal, unforgiving reviews. He was called "The Gravedigger of French Cinema" and was the only French critic not invited to the 1958 Cannes Film Festival. He supported Bazin in developing one of the most influential theories of cinema, the auteur theory.

In 1954, Truffaut wrote an article in Cahiers du cinéma, "Une Certaine Tendance du Cinéma Français" ("A Certain Trend of French Cinema"), in which he attacked the state of French films, lambasting certain screenwriters and producers, and listing eight directors he considered incapable of devising the kinds of "vile" and "grotesque" characters and storylines he called characteristic of the mainstream French film industry: Jean Renoir, Robert Bresson, Jean Cocteau, Jacques Becker, Abel Gance, Max Ophuls, Jacques Tati and Roger Leenhardt. The article caused a storm of controversy and landed Truffaut an offer to write for the nationally circulated, more widely read cultural weekly Arts-Lettres-Spectacles. Truffaut wrote more than 500 film articles for that publication over the next four years.

Truffaut later devised the auteur theory, according to which the director was the "author" of his work and great directors such as Renoir or Hitchcock have distinct styles and themes that permeate their films. Although his theory was not widely accepted then, it gained some support in the 1960s from American critic Andrew Sarris. In 1967, Truffaut published his book-length interview of Hitchcock, Hitchcock/Truffaut (New York: Simon and Schuster).