Alexander Cassidy is currently the Head of Derivatives Middle Office at Marex, a position held since 2025. Prior to this, they held various roles in the finance industry, including Clearing Operations Manager and Associate Director at R.J. O'Brien Limited from 2015 to 2018. Earlier experience includes positions as a Futures Operations Brokerage Analyst at Newedge in 2008 and a Trainee Broker at RP Martin in 2004, along with several roles in middle office and trade support functions across multiple firms.
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