Rosenberg began his career in the financial services industry in 1961 with the purchase of a membership at the Chicago Board of Trade. In 1965, he became a member of the CME, where he became involved in many facets of the exchange's governance.
As a CME member, he has been the chair of numerous committees that are integral to the exchange. Rosenberg served on the CME board of directors from 1970 to 1995, and for the maximum allowable term as chairman from 1977 to 1980. He also served as first vice-chairman of the board in 1976 and from 1983 to 1989. He was a member of the executive committee from 1975 to 1995 and held the chair from 1977 to 1980. He was also chief legislative liaison from 1986 to 1994 and served as chairman of the International Steering and Strategic Planning Committees. He was elected senior policy advisor to the board in 1991.
He is the former chairman of the investment advisory board of Lake Shore Asset Management, a hedge fund that federal regulators shut down after they accused it of hiding $30 million in losses from account holders. He resigned from Lake Shore on Aug. 13, 2007.
In December of 2009, he was charged in a civil suit of embezzling $79,000 from his former business partner, George Kopp, a senior market analyst with LaSalle Futures Group. The money came from a $100,000 investment Rosenberg solicited to start a brokerage.
He was also the chairman of Resolute Capital Growth Fund until 2010.
Rosenberg graduated from Lake Forest College with a degree in Economics, and served in the United States Army Counter Intelligence Corps.
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