Billy Magnussen was born in Woodhaven, Queens, New York (April 20,1985), the son of Daina, an aerobics instructor, and Greg Magnussen, a professional bodybuilder and kickboxer. He has two younger brothers. His maternal grandparents were Lithuanian immigrants. He grew up in Queens around Woodhaven Blvd. until the age of 10, when he moved with his family to Cumming, Georgia. Magnussen graduated from South Forsyth High School in 2003 and later graduated from the North Carolina School of the Arts.

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