Brennan began his career in commodities in 1981 as a broker and cattle salesman in Monmouth, Ill., while also doing local radio on ag markets. By 1992, he was in Chicago as a general manager at RB&H Financial Services, a mid-sized FCM. Brennan moved to ADM Investor Services in 1999 as VP of sales and marketing.
In 2002, he left for a stint with Trade Center, a California-based introducing broker that was looking to set up a Chicago office. For 2003-04, Brennan was with R.J. O'Brien as a vice president where he started a new OTC energy trading venture. From there he moved to his current employer, INTL FCStone, in 2004 as a senior vice president where he was responsible for clearing, risk management and customer service. In 2011, he was made managing director and moved to sales and customer service.
Brennan graduated from the University of Tennessee at Martin.
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