DALLAS - Jonathan E. Baum, the grandson of the co-founder of George K. Baum & Co., has been named chairman and chief executive officer of the Kansas City, Mo.-based investment banking and securities firm.

The 33-year-old executive succeeds his father, G. Kenneth Baum, who will continue at the firm as chairman emeritus and an advisory member of the management committee. Kenneth Baum, 63, headed the firm for more than 40 years.

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