- Wrestled in high school until a hamstring injury forced him to quit and drop out of gym class during his senior year; enrolled in a drama course instead and fell in love with acting.
- Made Broadway debut in the 2007 revival of The Ritz.
- Big break came in 2008 being cast as Casey Hughes on As the World Turns.
- Meryl Streep caught his Tony-nominated performance in Vanya and Sonia and Masha and Spike, and recommended him to director Rob Marshall for the film adaptation of Into the Woods; landed the role of Rapunzel's prince.
- Plays bass in the New York City-based band Reserved for Rondee.
- Appears in two movies (Bridge of Spies; The Big Short) nominated for 2015 Best Picture Oscars.
- 2013, Tony — Actor (Featured Role--Play): Nominee
- Daina Magnussen — Mother
- Greg Magnussen — Father
- Dane Magnussen — Brother
- Jesse Magnussen — Brother
- Attended University of North Carolina School of the Arts, Winston-Salem, North Carolina, United States
Season 2, Episode 21
- Birth Name: William Gregory Magnussen
- Birth Place: Woodhaven, Queens, New York, United States
- Birthday: April 20, 1985, Aries
- Profession: Actor, Musician