Director of The Dark Knight, Christopher Nolan, has written a very touching tribute to Heath Ledger.
One night, as I’m standing on LaSalle Street in Chicago, trying to line up a shot for “The Dark Knight,” a production assistant skateboards into my line of sight. Silently, I curse the moment that Heath first skated onto our set in full character makeup. I’d fretted about the reaction of Batman fans to a skateboarding Joker, but the actual result was a proliferation of skateboards among the younger crew members. If you’d asked those kids why they had chosen to bring their boards to work, they would have answered honestly that they didn’t know. That’s real charisma—as invisible and natural as gravity. That’s what Heath had.
Heath was bursting with creativity. It was in his every gesture. He once told me that he liked to wait between jobs until he was creatively hungry. Until he needed it again. He brought that attitude to our set every day. There aren’t many actors who can make you feel ashamed of how often you complain about doing the best job in the world. Heath was one of them.
One time he and another actor were shooting a complex scene. We had two days to shoot it, and at the end of the first day, they’d really found something and Heath was worried that he might not have it if we stopped. He wanted to carry on and finish. It’s tough to ask the crew to work late when we all know there’s plenty of time to finish the next day. But everyone seemed to understand that Heath had something special and that we had to capture it before it disappeared. Months later, I learned that as Heath left the set that night, he quietly thanked each crew member for working late. Quietly. Not trying to make a point, just grateful for the chance to create that they’d given him.
<snip>
You should read the entire piece, it is very touching.
More:
http://www.yourmoviestuff.com/movie-news/dark-knight-director-remembers-heath-ledger/