Pitt and his co-workers have been shooting scenes for the post-apocalyptic project in Glasgow, which was made to look like Philadelphia, Pennsylvania, for the past two weeks.
They wrapped up filming in Scotland this week (begs29Aug11) and Kleiner insists it has been a great experience.
He tells the BBC, ""The co-operation we had from the Glasgow Film Office and indeed from across the city council made it all possible, and the people of Glasgow were incredibly welcoming. It's been a very successful shoot here.""
World War Z has also been filmed on location in Malta and in Cornwall, south-west England.