Which author has used more pseudonyms, W. E. B. Griffin or Piers Anthony? 
W. E. B. Griffin: William Edmund Butterworth III (born November 10, 1929), better known by his pen name W. E. B. Griffin, is a writer of military and detective fiction with 38 novels in six series published under that name. Piers Anthony: Piers Anthony Dillingham Jacob (born 6 August 1934 in Oxford, England) is an English American author in the science fiction and fantasy genres, publishing under the name Piers Anthony.
i don't know