How do you define "Greatest" though. Some say that Thurston was the greatest and that his personality and presence on stage was unparralleled even to this date. Blakstone's presence was also considered phenomenal and I know someone who went to his show 3 times just to figure out how he made a miniature horse appear on stage (his understanding and use of misdirection was that good). Houdini, depsite not being the greatest still has his name remembered and called out when you ask someone to name a famous magician. Doug Henning was the best known magician due to his television appearances in the 70's and he is credited with taking magicians out of long tails and bowties and into the 20th century. Because of the exposure one now gets with television, Copperfield has certainly become one of the best known illusionists of our time, he is certainly the highest grossing illusionist of our history but is he THE GREATEST? Something to ponder.
Got your copy of "The Complete THE MENTALIST" yet?