Mark Proksch (born July 19, 1978) is an American comedian, actor and writer best known for starring on the US television series The Office in which he played Nate, and as a fictionalized version of himself in the On Cinema universe. Proksch had the alias of Kenny "K-Strass" Strasser early in his career. He went onto small-market local newscasts and pretended to be a yo-yo master. Inevitably, he would succeed in making the newscaster feel uncomfortable. This went on for some time until his true identity was revealed. He appeared on WGN and the Conan show before moving on to a legitimate television career as an actor.