Philippa Boyens
Philippa Jane Boyens MNZM (born 1963) is a New Zealand screenwriter who co-wrote the screenplay for The Lord of the Rings series, King Kong, The Lovely Bones, and the three-part film series The Hobbit. Description above from the Wikipedia article Philippa Boyens, licensed under CC-BY-SA, full list of contributors on Wikipedia.
Filmography
A Filmmaker's Journey: Making 'The Return of the King'
Recreating the Eighth Wonder: The Making of 'King Kong'
Beyond the Movie: The Fellowship of the Ring
Beyond the Movie: The Return of the King
Ringers: Lord of the Fans
The Quest Fulfilled: A Director's Vision
Passage to Middle-Earth: The Making of 'The Lord of the Rings'
From Book to Script: Finding the Story
J.R.R. Tolkien: Origins of Middle-Earth
Farewell, Friends!
Warriors of the Third Age
In the Halls of the Elven-king
The Journey Back to Middle-earth
The Company of Thorin
Under the Shadow of the Mountain
From Book to Script: Forging the Final Chapter
Summoning Smaug: The Last of the Fire-drakes
The Passing of an Age