David Heyman — British Producer born on July 26, 1961,

David Jonathan Heyman is an English film producer and the founder of Heyday Films. In 1999, Heyman secured the film rights to the Harry Potter film series and went on to produce all eight installments, becoming the most important member of the crew to be involved in all the films. In 2013, he was nominated for an Academy Award for Best Picture as the producer of Gravity, his second collaboration with director Alfonso Cuarón after Harry Potter and the Prisoner of Azkaban... (wikipedia)

I love books. I read voraciously, and I happened to have been fortunate to have been in the right place at the right time.
But I can't imagine Harry being a stockbroker at 35. That doesn't really seem the stuff of 'Harry Potter'.
Because actually it's really hard to get things made. It takes years. To fight the fights you inevitably have to fight, even when you've produced Harry Potter, you'd better have the commitment and the passion to knock down walls, not take no for an answer.
I thought if I was lucky it would be a nice, modest-sized, modest-budgeted film that would be a modest success. And then something happened.
I think it's great to see how they've grown up, not just as actors but as people. They're still very much the same kids that I met many years ago. They've grown up and they are funny and wicked and naughty and bright, and I think as actors their work is just getting better and better. They've blossomed.