Sean Tillmann-Hauser (born February 6, 1978) is an American singer-songwriter and actor. He has performed and released studio albums as Sean Na Na and as a member of hardcore band Calvin Krime, but is best known for his work under the name Har Mar Superstar. == Early life == Tillmann was born in Marshall, Minnesota, on February 6, 1978, at Weiner Memorial Hospital. In 1987, his family moved to Owatonna, Minnesota. He graduated from the Perpich Center for Arts Education... [more on Wikipedia]