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. The number of copies of his books in print is estimated between 290 million and 500 million. They have been published in 33 languages and 40 countries. Ludlum also published books under the pseudonyms Jonathan Ryder and Michael Shepherd.
Rog Phillips Roger Phillips Graham (1909-1966), born in Spokane, Washington, was an American science fiction writer who was published most often using the name Rog Phillips, but also used other names. Of his other pseudonyms, only Craig Browning is notable in the genre. He is associated most with "Amazing Stories" and is known best for short fiction. He was nominated for the Hugo Award for Best Novelette during 1959.