Brad Katsuyama, the CEO of IEX Trading, continues his war on high frequency trading in an interview with Wall Street Week. Katsuyama zoomed into the realms of financial celebrity when Michael Lewis cast him as the hero in his book “Flash Boys,” a take down of HFTs. Katsuyama says that investors need more education and transparency to fight HFT. IEX is “using technology to fight back” against the advantages insiders command, he says.