"[...] His trading style was to be neutral and take the other side of the customer orders, which he did profitably. He exited the trading business in 2002 as electronic trading negatively impacted the trading floor. [...]" Hmm... did he really take the other side of the customer trades, or did he maybe just frontrun and sold it to his customer with a little profit share? S.a. https://www.marketswiki.com/wiki/Lee_Tenzer