(New York Daily News) - The man who directed an anti-Islam film that sparked protests in 20 Muslim countries is the same person best known for making a string of low-budget, softcore porn movies in the 1970s and 1980s, Gawker reports.

Casting notices for the inflammatory film, originally called “Desert Warrior," listed Alan Roberts as the director. According to IMDB, Santa Monica, Calif.-based Alan Roberts, 65, had directed films with titles like "The Happy Hooker Goes to Hollywood,” and “The Sexpert.”

Gawker said it had spoken to cast, crewmembers and friends to confirm the same Roberts behind “Young Lady Chatterley” was in fact the director of the anti-Islam movie renamed “Innocence of Muslims.”

"I am sure it was the same Alan Roberts, as I remember him speaking about this project," colleage and filmmaker David A. Prior told Gawker.

Roberts was brought on to direct the film by producer “Sam Bacile,” apparently an alias used by Nakoula Basseley Nakoula, 55, a southern California resident and convicted felon.

Nakoula, a self-described Coptic Christian, is believed to be the key figure behind the 14-minute, amateurish movie that mocks the Prophet Mohammad. The film’s trailor was translated into Arabic and spurred a wave of furious anti-Western protests, leading to the death of four Americans in Libya, among them U.S. Ambassador Chris Stevens.

Actors in the movie have since said they were duped about the film’s plot and claim that many of their lines were over-dubbed.

It was still unclear how Roberts came to direct the film or if he knew “Bacile” prior to shooting the movie outside of Los Angeles in 2011.

Gawker reached a “business associate” who said Roberts had turned off his phone after the protests erupted.

The Los Angeles Times reported that Roberts might also be an alias for “a 65-year-old man named Robert Alan Brownell of Canyon Lake in Riverside County.”