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Research into the identity of Erdnase
Martin Gardner's research, now largely discredited, proposes that the real Erdnase was Milton Franklin Andrews, and that the book was ghost-written by William John Hilliar. (S. W. Erdnase spelled backwards is E.S. Andrews, lending support to the theory that Andrews was the author's last name)
There are numerous possible candidates discovered by David Alexander, Richard Hatch, and Todd Karr (among others), any of whom might be the pseudonymous author. The candidates by Alexander and Hatch have been profiled in (respectively) Genii and MAGIC, while Karr's candidate is identified a Midwestern-based con artist named E. S. Andrews who was active around the turn of the century and whose biography seems to fit Erdnase's.
Erdnase, The Musical
Peregrine Arts is in the process of developing, for Spring 2008, "Who Killed Erdnase?", a new music-theater work by the Ridge Theater and Gavin Bryars team in conjunction with author Glen David Gold.  
External Resources and References
- Genii Forum Topic on Erdnase
- January 2000 Genii - New Light on Erdnase by David Alexander
- The Man Who Was Erdnase by Bart Whaley and Martin Gardner and Jeff Busby ISBN 9781563010002
- THE MAGICIAN AND THE CARDSHARP by Karl Johnson for American Heritage Magazine, which includes the sidebar WHO WAS ERDNASE? CARD CONJURING’S MOST ENDURING MYSTERY
- Eastman's Online Genealogy Newsletter Vol. 5 No. 35 – August 26, 2000 - Whatever Happened to S.W. Erdnase?
- The Expert at the Card Table: Artifice, Ruse, and Subterfuge DVD from Geno Munari (Houdini.com) contains a film characterization of S.W. Erdnase, interviews with Richard Hatch and Bart Whaley on the Mystery of Erdnase, an interview with Martin Gardner, "The Gardner-Smith Correspondence", "The Murderous Card Shark" by Martin Gardner and John Conrad, "Was Erdnase Abdul Aziz Khan" By Martin Gardner, and newspaper articles.