He started his cinematographic career as a producer with François Reichenbach portraying musicians such as Arthur Rubinstein in 1969, and Yehudi Menuhin in 1971.

In 1972, Rochat partnered with Claude Giroux to produce his first feature film, The Killer, starring Jean Gabin as the chief of police Le Guen.

In 1976, Rochat produced Sex O'Clock USA, a French non-fiction feature documentary directed by François Reichenbach.

Then in 1980, Rochat produced Tusk, directed by surrealist Alejandro Jodorowsky, and based on the novel Poo Lorn of the Elephants, by Reginald Campbell.

This TV feature film tells the story of a movie producer who desires to live the experiences of O's Sir Stephen.