Wayne G. Hammond is Assistant Librarian in the Chapin Library of Rare Books at Williams College.
Christina Scull is the former Librarian of Sir John Soane's Museum in London, England. They wrote J.R.R. Tolkien: Artist and Illustrator and have produced annotated editions of Tolkien's Roverandom and Farmer Giles of Ham. They are writing a major reference book about Tolkien.