Question: Who had more pseudonyms, Robert Ludlum or Clement Greenberg?
Sentence (from "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.
Relevant evidence: Yes