Charles replaces Miranda Sambles who left PepsiCo last year to take over as marketing director of Mars Petcare.
Charles has been with PepsiCo since 2005, including holding senior marketing roles on Doritos and Tropicana.
His appointment comes as Walkers beds in launches of its latest product varieties, Deep Ridged and Baked Stars.
Charles will also be tasked with overturning falling sales of its core Walkers brand. According to Nielsen, value sales of Walkers fell 2% in the year ending December 2012.
In March, Walkers launched a TV and social media campaign, showcasing its switch to British-sourced flavourings, which featured long-standing brand ambassador Gary Lineker and his dad, Barry.
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