Mark Proksch

Mark Proksch is an American comedian, actor, and writer, best known for starring on the US television series The Office where he played Nate. Proksch also had the alias of Kenny KStrass Strasser early in his career. He would go onto small market local news casts and pretend to be a yoyo master. Inevitably, he would succeed in an attempt to make the newscaster feel very uncomfortable. This went on for sometime until his true identity was revealed. He appeared on WGN as well as the Conan show before moving on to a legitimate television career as an actor.

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Source: Wikipedia