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Leon Stiel is an experienced professional in the field of financial technology and risk management, currently serving as the Head of Equities Risk Technology at Millennium since May 2022. Previously, Leon held various leadership positions at Citi from May 2017 to May 2022, including Global Head of Cross Asset ETF Technology and Global Head of Equities Market Making Technology. Prior to that, Leon worked at Credit Suisse from January 2008 to May 2017, where roles included US Head of Equity Derivatives IT and Global Head of Convertibles IT. Leon's career began at AM Investment Partners LLC as Portfolio Manager and CTO from August 2001 to August 2007. In addition to extensive professional experience, Leon Stiel completed a Certificate in Cryptocurrency from the Massachusetts Institute of Technology in 2021 and earned a degree from Carnegie Mellon University between 1994 and 1998.