John J. Mack (born November 17, 1944) is a Senior Advisor to the investment firm Kohlberg Kravis Roberts and the former CEO & Chairman of the Board at Morgan Stanley, the New York-based investment bank and brokerage firm..
Mack worked at several firms around Wall Street before starting his career at Morgan Stanley in 1972 as a salesman, and has since worked for the company for nearly thirty years. Rising steadily to positions of increasing responsibility, Mack eventually headed the firm’s Worldwide Taxable Fixed Income Division from 1985 to 1992.
In 1987, he became a member of the board of directors. In March 1992, he assumed responsibility for Morgan Stanley’s day-to-day operations as chairman of the operating committee. He was named President of Morgan Stanley in June 1993. Mack served as president, chief operating officer and a director of Morgan Stanley Dean Witter & Co. from May 1997 when the firm was created by the merger of Morgan Stanley and Dean Witter, two of the world’s leading financial services companies.
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