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Peter Linz (born June 28, 1967) is an American puppeteer and voice actor. Known for his work with the Muppets, Linz's most prominent role is performing for the character Walter who was introduced in the 2011 feature film The Muppets. Since 1991, Linz has performed on Sesame Street, where he later took on the roles of Herry Monster and Ernie on Sesame Street in 2017. Wikipedia