Charles Ferguson, the documentary filmmaker who won an Oscar this year for Inside Job, is to direct a feature film for HBO about WikiLeaks founder Julian Assange.

It would be the first move into TV feature making for Ferguson, who investigated the financial industry meltdown in Inside Job and looked at the American war in Iraq in Academy Award-nominated No End in Sight.

The HBO-BBC biopic of Assange is reported to be based on a New Yorker article by Raffi Khatchadourian titled No Secrets: Julian Assange's Mission for Total Transparency.

Assange, 39, is currently out on bail in the U.K., awaiting an appeal of his extradition to Sweden for questioning in a sexual assault investigation. He returns to a British court in July.

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WikiLeaks founder Julian Assange speaks in London, where he is appealing his extradition to Sweden, on April 9. (Akira Suemori/Associated Press)

The Australian publisher and entrepreneur who runs WikiLeaks, the website that released thousands of secret diplomatic cables, is also under investigation by the U.S. Department of Justice.

There are several film projects about Assange in the works, including a documentary by Alex Gibney, who directed Enron: The Smartest Guys in the Room.

Stephen Spielberg's Dreamworks has bought the rights to WikiLeaks: Inside Julian Assange's War on Secrecy, the book by Guardian journalists David Leigh and Luke Harding.

Annapurna Productions has said it is financing a  film about Assange to be produced by Mark Boal, who produced and wrote Academy Award-winner The Hurt Locker.

Assange himself  is working on a memoir.