Theodore Hardeen was a magician and escape artist, best known as Harry Houdini's brother. So dedicated was he to Houdini that Hardeen usually introduced himself as the “brother of Houdini." He was the founder of the Magician's Guild. He was born as Ferencz Dezso Weisz or Weisz Ferenc Dezső in Budapest, Hungary and went by the name of Theodore Weiss when the family was living in Appleton, Wisconsin. Wikipedia
The definitive Wikipedia entry for Theodore Hardeen. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Theodore_Hardeen