Mackenzie joined TD Ameritrade from MF Global, where he had been a vice president of FIX and DMA offering electronic trading solutions. He left MF Global in March of 2011, before their collapse in August of 2011.
He was also with Penson GHCO and its predecessors in business technology roles.
Mackenzie holds a bachelor of arts from Middlebury Collge in biology and psychology. He also holds a masters in business administration from the University of Notre Dame's Mendoza College of Business in strategic consulting and finance.
Mackenzie participated in the MarketsWiki Education World of Opportunity series in Chicago in 2016.
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Delisting of Securities of Fred’s, Inc., BIQI International Holdings Corporation, Alta Mesa Resources, Inc., and Diversicare Healthcare Services Inc. from The Nasdaq Stock Market
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