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. W. E. B. Griffin:  He has also published under 11 other pseudonyms and three versions of his real name (W. E. Butterworth, William E. Butterworth, and most recently William E. Butterworth III).
i don't know