Kellogg Company has hired Clive Sirkin as chief growth officer, effective Dec. 15. Sirkin worked on the company’s account at advertising agency Leo Burnett Worldwide for more than 15 years before going to Kimberly-Clark, where he was CMO since 2012. Sirkin will lead a Global Growth Team to develop the company’s long-term category strategies. He will report directly to John Bryant and serve on the company’s Global Leadership Team.