Who had more pseudonyms, Robert Ludlum or Clement Greenberg?
Robert Ludlum: Robert Ludlum (May 25, 1927 – March 12, 2001) was an American author of 27 thriller novels, best known as the creator of Jason Bourne from the original "The Bourne Trilogy" series. Robert Ludlum:  Ludlum also published books under the pseudonyms Jonathan Ryder and Michael Shepherd. Clement Greenberg: Clement Greenberg ( ), occasionally writing under the pseudonym K. Hardesh (January 16, 1909 – May 7, 1994), was an American essayist known mainly as an influential visual art critic closely associated with American Modern art of the mid-20th century.
Robert Ludlum