Micozzi has worked on a number of PepsiCo brands over the past 13-years and most recently was head of marketing for the Pepsi's bottling group franchise in Spain.
In his role as head of marketing for Walkers crisps, he will be responsible for driving up sales of household brands such as Monster Munch, Quavers, Frazzles and Walkers Sensations.
Recent innovations across the portfolio include a charity tie-up with Comic Relief and the Walkers Flavour Cup.
Celebrities used in its core Walker Crisp advertising include Gary Lineker and Lionel Richie.
Micozzi takes over from Greg Lyons, who is moving to the role of vice-president marketing, PepsiCo drinks Canada.
During his tenure as head of marketing for Walkers crisps, Lyons was credited with overseeing campaigns, including its high-profile 'Do us a Flavour' activity.