While working on "The Lord of the Rings", Greg Butler worked on the effects for a fictional character first imagined by what famous author?
Greg Butler (visual effects supervisor):  While reluctant at the requirement of moving to New Zealand, Butler was convinced by his writer-actor brother Jared to jump at the opportunity of working for Weta Digital in "The Lord of the Rings". Greg Butler (visual effects supervisor):  His biggest achievement was working in the creation of Gollum. Gollum: Gollum is a fictional character from J. R. R. Tolkien's legendarium.
J. R. R. Tolkien