Michael Mauboussin, chief investment strategist at the Legg Mason unit that’s home to Bill Miller, left the firm last week.

Mauboussin, who had been at Legg Mason Capital Management since 2004, departed Jan. 2 and there are no plans to replace him, Mary Athridge, a spokeswoman for Baltimore-based Legg Mason, said last week in an e-mail. Mauboussin is promoting his new book “The Success Equation: Untangling Skill and Luck in Business, Sports and Investing” (Harvard Business Review Press, 320 pages, $27).

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