Nick Leeson, English trader whose unsupervised speculative trading caused the collapse of Barings Bank. James Paul Lewis, Jr., ran one of the biggest ($311 million) and longest running Ponzi Schemes (20 years) in U.S. history. Gregor MacGregor, Scottish conman who tried to attract investment and settlers for the non-existent country of Poyais. Bernard Madoff, creator of a $65 billion Ponzi scheme – the largest investor fraud ever attributed to a single individual.
Bill Mastro, sports memorabilia kingpin who altered the famous T206 Honus Wagner card that eventually sold for $2.8 million. He also engaged in the practice of "shill bidding" — artificially raising bids on items in his auction house. Matt the Knife, American con artist, card cheat and pickpocket who, from the ages of approximately 14 through 21, bilked dozens of casinos, corporations and at least one Mafia crime family out of untold sums. Gaston Means, a professional conman during U.S. President Warren G. Harding's administration. Barry Minkow and the ZZZZ Best scam.