Michael Murnane is a concept artist/sculptor, and the author of the short story "Wat Tambor and the Quest for the Sacred Eye of the Albino Cyclops" in Star Wars: Visionaries. His work can be seen in The Art of Star Wars Episode II: Attack of the Clones and The Art of Revenge of the Sith.
Sources[]
Clay Characters: An Interview with Mike Murnane on StarWars.com (original site is defunct)
Meet the Episode III Art Department on StarWars.com (original site is defunct)
Tambor, Wat in the Databank (original site is defunct)