O'Callaghan began his career on the Chicago Mercantile Exchange floor, followed by the London International Financial Futures and Options Exchange (LIFFE). He gained an additional 15 years of experience in institutional sales with major global financial institutions before joining Wedbush Futures forerunner Penson GHCO in September 2007.
O'Callaghan is a native of Limerick, Ireland. He to Chicago in 1989.
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