Paul Warren Fairman was an an American editor and writer in a variety of genres under his own name and under pseudonyms. - Wikipedia He also wrote under various house pseudonyms including Ivar Jorgensen (which began as a personal pseudonym). Several juvenile novels by Fairman were based on outlines by Lester del Rey and published as by del Rey. *Note from http://www.sf-encyclopedia.com: born Missouri: 22 August 1909 [1916 has also been incorrectly given]*