Johannah Ladd was the secretary general of the FIA European Principal Traders Association (EPTA) from March 2014 until December 2015. On January 20, 2016 it was reported that she would join Quantlab Financial, a high-speed proprietary trading firm, as the head of its London office. Quantlab is one of 27 firms represented by the EPTA, which was founded in 2011 to represent the interests of low-profile proprietary trading firms.
Ladd joined EPTA at the time when "Flash Boys", the book by Michael Lewis, had just come out alleging that high-speed traders had rigged US stock markets, and high-speed traders came under heavy public scrutiny. She was highly involved in providing technical input on new European regulation, in particular the revision of the EU trading rulebook, the Markets in Financial Instruments Directive (MiFID), which is set come into force in 2018.
Before joining EPTA, Ladd was general counsel at Flow Traders, a Dutch high-frequency-trading prop shop. 
Early in her career she worked as a journalist for Dow Jones Newswires.
She is a graduate of Harvard Law School.
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