Sandy Weill has given his heir apparent yet another job. The Travelers CEO named James Dimon, 38, universally known as Jamie, as the head of brokerage operations at Travelers' Smith Barney unit. Dimon, now president and COO at Travelers, replaces Joseph J. Plumeri, a 28-year brokerage-industry veteran who is being eased upstairs to serve as Travelers' vice-chairman.

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