He joins from creative house Tequila/London, where he was digital strategy director. Prior to this, de Wynter held the deputy managing director post at digital agency Mook.
De Wynter has 12 years experience working on projects with brands such as T-Mobile, Vodafone, Pedigree, Peroni and Ballantine's.
Twentysix chief executive Gail Dudleston said: "Lex has a deep understanding of technologies across the digital media mix, with a particular focus on web and mobile, as well as the social and user trends that define their development."
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