
Head of Trading
James Maxfield is Head of Trading EU at Gemini, based in Dublin, Ireland. He is responsible for managing the spot and derivatives trading portfolio during European hours, handling trade flow and executing client orders using algorithms to optimise P&L and reduce slippage. He also assists in the development, backtesting, and implementation of systematic trading strategies using Python, and compiles daily and weekly market commentary distributed to institutional and retail clients. In November 2025, he participated as a panellist at a breakfast event hosted by The Big Whale in Paris, in partnership with Gemini, focused on the institutional adoption of cryptocurrencies. The panel addressed topics including collateral management, on-chain repo, and the integration of stablecoins into banking workflows.
Prior to Gemini, Maxfield held trading and operations roles at Susquehanna International Group (SIG) in Dublin. From December 2020 to August 2021, he worked as a Trader, pricing and trading financial products including futures, CFDs, swaps, and FX forwards, and applied Python and SQL to automate desk processes. Before that, from August 2018 to December 2020, he completed SIG's Trading Operations Analyst Graduate programme, rotating through functions including risk, options trade support, ETF trade support, ETF pricing, stock loan, and corporate actions. He holds a degree from the University of Limerick and certifications in finance and data analysis.

CEO of Europe
Mark Jennings is Head of Europe at Gemini, a position he has held since December 2024. He joined alongside a broader buildout of Gemini's European senior management team and has authored public commentary on the company's regulatory milestones in the region, including Gemini's MiCA licence, its MiFID II licence, and the selection of Malta as its MiCA hub.
Prior to Gemini, Jennings served as CEO of Crypto Facilities, the FCA-authorised crypto derivatives platform operating as a subsidiary of Kraken, where he led strategy development and execution for the platform's global client base. Before that, he was Chief Operating Officer for Kraken's European operations, with responsibility for establishing the company's regional presence. He has also held senior roles at TP ICAP, Credit Suisse, and Citi. His professional background spans trading systems, risk management, hedge funds, and derivatives. He holds a degree from Dublin City University, a Financial Risk Manager certification from GARP, and PCF-1 and PCF-42 accreditations from the Central Bank of Ireland.








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