"The Documentarian".
From the Oscar-winning Taxi to the Dark Side, which tells the story of an Afghanistan taxi driver who was tortured and killed at Bagram Air Force Base in 2002. To the Emmy Award-winning Going Clear which looks closely at the world of Scientology. To We Steal Secrets - the story of Wiki leaks. As Alex Gibney describes it, he's drawn to stories that reveal abuses of power.
He's been called the most important documentarian of our time by Esquire Magazine.
I assumed, as I sat down with Alex, that this was a man of strong beliefs, determined to tell stories that right what he saw as wrongs.
But his story and his view of the world is much more complex than that.