He was instrumental in building out the US operation of the crypto exchange giant FTX, which expanded into offering stock trading.
In August 2022, FTX US received a cease-and-desist letter from the Federal Deposit Insurance Corporation due to “false or misleading statements” about certain products being eligible for insurance protection, which included a now-deleted tweet by Harrison as an example. At the time, Harrison was quoted in the press as saying, “We really didn’t mean to mislead anyone, and we didn’t suggest that FTX US itself, or that crypto/non-fiat assets, benefit from FDIC insurance.”  
Harrison previously spent nearly two years at Citadel Securities, moving from head of ETF Technology to become head of semi-systematic technology.
Before that he was a senior software developer at Headlands Technologies.
He spent seven years at Jane Street, the quantitative trading firm where FTX's founder and CEO, Sam Bankman-Fried, got his start.
Harrison has both a Bachelor's degree and a Master's degree in computer science from Harvard.
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