David Johnson has served as a member of Penson Worldwide, Inc.’s Board of Directors since January 2006. Mr. Johnson also serves as a member of the board of directors of Condell Medical Center. From 1982 to 2005, he served in various capacities at Morgan Stanley, most recently as a managing director. Mr. Johnson was a member of a number of exchanges, including the Chicago Board Options Exchange, the Chicago Stock Exchange and the American Stock Exchange. He was in the United States Navy Reserve from 1966 until 1972. Mr. Johnson attended the New York School of Finance.