It was the "fastest paced" thriller for the 53-year-old star, who has previously directed movies like "Little Man Tate", "The Beaver" and episodes of TV shows like "Orange Is the New Black" and "House of Cards".
Clooney is also a producer on the movie, which releases in India on May 13.
"Ah, well, the two most loved movie stars in Hollywood. I mean really fun, both of them. Fun for them to be together. Easy, professional. I mean it just gets easier, honestly, any time that you work with people that have as much experience, and that are as talented as this. And in some ways it's simple. And I think both George and Julia share that."
"I think they love to work, but they also love to laugh and they like to keep it simple. George is also the producer on the movie, which is just a Godsend for me, to have somebody with such an experienced and talented director, who is right there to support you. And it's been wonderful having him as a partner."
The movie, being released in India by Sony Pictures Entertainment, revolves around Lee Gates (Clooney), the charismatic host of a popular financial network show. But after he hawks a high tech stock that crashes, an irate investor (Jack O'Connell) takes Gates, his crew, and his ace producer Patty Fenn (Roberts) hostage live on air.
"It's exciting, fast-paced. I think it's the fastest paced movie I've ever done, if not ever seen. And it brings together all of these different people in sort of a tapestry, all of their different motivations, all surrounding one idea - money - and how money in some ways is our meaning in life, is how we rate ourselves."
The entire story takes place in real-time and Foster says the focus is on this man who is looking for an answer but has been given a lot of nonsense about why he lost all his money, which certainly has an echo of reality.
"And that's really being done on purpose, to keep us away from the actual answers, to keep the middleman in some ways in control, because they have all the quote information. And to keep it as mysterious as possible so people don't start asking questions.
