Writing Science Fiction and Fantasy for Film

All three authors have participated in writing or adapting stories for the silver screen, in very different types of projects (Iron Sky, A.I. and Cirkeln). How do their experiences measure with each other? And how do you end up writing for a movie? Can the author get her or his voice heard, or will the movie making apparatus win in the end?

Ian Watson, Jessica Elgenstierna, Johanna Sinisalo, Sara Bergmark Elfgren