Kellogg Co. said Chief Executive David Mackay would retire at the start of next year, capping one of the most turbulent times for Kellogg in the last decade.  The departure of Mr. Mackay, 55 years old, was mildly surprising to Wall Street, but chief operating officer John Bryant, who will become CEO, said he isn't planning any dramatic changes to the company's direction. Kellogg's shares barely budged on the news.
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