Interactive Brokers Group Inc.

* Emigrated to the U.S. from Hungary in 1965. * Became a member of the American Stock Exchange in 1977 as an individual floor trader after working for 10 years as a computer programmer. * Pioneer in the advancement of options markets and electronic trading. Influential in the formation and structuring of the Boston Option Exchange (BOX) and the International Securities Exchange (ISE).

* Joined Timber Hill in 1985. * Responsible for the development and maintenance of the Company's trading, processing, and communications systems. Presently, he concentrates on development of brokerage systems. * Ph.D. in Physics from MIT 1985.

* Joined in 1990 as a software developer. * The head of software development for trading and risk management systems, as well as certain facets of IB’s brokerage system (exchange interfaces, smart-routing and front-end). * M.S. from Technical University of Budapest in communications engineering with emphasis on digital signal processing.

* Special Counsel to the law firm Dechert LLP. * Specializes in commercial counseling and litigation with an emphasis on securities and commodities law. * J.D., magna cum laude, from Boston University School of Law. * B.A. in Economics from New York University.

* Professor of Finance and Director of the Financial Markets Research Center at the Owen Graduate School of Management, Vanderbilt University since 1980. * Member of the Board of Directors of the Option Clearing Corporation, 2005 - 2008. * A.B. degree from Swarthmore College in 1961. * M.B.A. and Ph.D. degrees from the Graduate School of Business of the University of Chicago in 1963 and 1966, respectively. * Fellow of the American Finance Association.

* Special advisor to the International Securities Exchange, formerly Chairman from 2002 – 2006. * From 1994 - 1997, and again from 1999 - 2000, served as Chief Executive of the Hong Kong Futures Exchange and Chairman of the HKFE Clearing Corporation. * From 1986 – 1993, served as Senior Executive Vice President in charge of all derivatives activity at the American Stock Exchange. * Served as Executive VP of the NYSE from 1983 – 1986. * Bachelor of Science degree in finance from UCLA in 1955. * Completed Advanced Management Program at Harvard in 1986. * In 2005 named to FIA Futures Hall of Fame and received Options Industry Lifetime Achievement Award.

* Professor of Finance and Business Economics, and director of the Center of Investment Studies at the University of Southern California, where he holds the Fred V. Keenan Chair in Finance at the Marshall School of Business. * Serves as a director of the Clipper Fund and as the research coordinator of the Institute for Quantitative Research in Finance. * From 2002 – 2004, served as the Chief Economist of the U.S. Securities and Exchange Commission. * Ph.D. in Economics, University of Chicago 1982.

Mr. Brody began his career at Timber Hill in 1987 as Treasurer. As the business grew internationally, he became Chief Financial Officer for both Timber Hill and Interactive Brokers Group. Mr. Brody was a key contributor to the Group's expansion from a U.S.-based options market maker to an international financial services firm. Prior to joining Timber Hill, Mr. Brody spent five years with Mocatta Metals Corporation, an international commodities trading firm. Mr. Brody holds a B.A. degree in economics with distinction from Cornell University.