Leif Stenberg(1932-1985)

Leif Stenberg was a Swedish business man and entrepreneur who also operated under the name Leif Skiffer. In the media. The media named him "Mr. X" for his ability to remain invisible in the gangster circles in which he was believed to be active in. Stenberg's heart problems caused him to undergo surgery to insert a mechanical heart of the type Jarvik-7.