Winkler was previously the European business director for Braun products at Gillette, where he was responsible for marketing and sales strategy.
Prior to this, he was media director at Gillette and also worked at Reckitt Benckiser and Kraft Foods.
Winkler will be based at Carat International's London offices, joining a 120-strong team.
Susannah Outfin, chief executive of Carat International, said: "Michael will bring invaluable experience to Carat. His recruitment is part of our ongoing strategy of bringing the broadest range of communication experience into the agency to meet our client needs."
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