Dehnert was with the Hull Group (now part of Goldman Sachs), as a financial engineer in 1992. He relocated from Chicago to Frankfurt in 1995, where he helped Hull build its electronic equity options trading system and businesses in Europe.
In 1996, Dehnert was named a principal at Hull. In 1997, he relocated to Hull's joint venture with Daiwa Securities in Tokyo, where he focused on the venture's launch into single stock options.
In 1999, Dehnert returned to Chicago to take up his current responsibilities at Goldman Sachs and assist with Hull's ISE implementation. He became a Goldman Sachs managing director in 2000 and a partner in 2002. In 2002, he moved to New York to help develop a strategist group for the equities division. In 2004, he was named head of the quantitative trading business in equities.
Dehner holds a bachelor of science degree and MBA degree from Washington University in St. Louis, where he serves on the External Advisory Board of the School of Engineering's Department of Electrical & Systems Engineering. 
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