Melissa Rosenberg.
She also wrote the Twilight script.
Melissa Rosenberg is the screenwriter who wrote the movie script for Twilight, New Moon and Eclipse. I'm sure she will also write for Breaking Dawn as well.
A transcript of New Moon can be found at Script O Rama. See the related link.
There is a line in the script that says she has to.
i went to scribd.com and in the little box on the top of the page type in new moon script u can find it from there!!! but it won't be like a book it's gonna have all like the fade in or zoom onto Bella on the ground here is the exact link: http://www.scribd.com/doc/15435689/New-Moon-Script
Winnie Holzman wrote the script and Stephen Shwartz wrote the music and lyrics.
Melissa Rosenberg wrote the screenplay for "Twilight," based on the novel by Stephenie Meyer.
New Moon's screenplay was written by Melissa Rosenberg.
Stephenie Meyer wrote "New Moon" in 2006.
The wordless music contributed to New Moon was written by Bradley Mastronofe
George Lucas came up with the stories. As far as screenplays, he did the script for A New Hope, and Leigh Brackett & Lawrence Kasdan wrote the script for Empire Strikes Back, with Lucas and Kasdan for Return of the Jedi. As far as the prequels, Lucas wrote Eps. I & III, and he wrote Ep. II with Jonathan Hales.
The script hasn't even been written yet...
the script