He started to act in 2007 and his first job was with The Ritz at the Broadway stage. Since he showed the exceptional talent with the passion he had in acting, he was able to get bigger role in the year 2008. He got the role to play in the Happy Tears together with actress called Demi Moore. He was played as Roger McAlister and he was the guest-star for the Broadway Empire in the year 2012. He played as the lover of Gillian Darmody. He has been nominated for different awards because of the exceptional acting.

Billy Magnussen is known to be a multi-talented person and he showed his talents in many movies and tv shows. Besides acting, he was also the guitarist, bass player, a singer and also a songwriter. He is the songwriter for the NYC-based bands called The Dash together with the Reserved For Rondee. This improved his status and the perception of him changed in a drastic way. The singing style is among the things that had made many people to be attracted to him. Since he is engaged in different areas, he has achieved an impressive net worth and he is a person who values too much his time and he always says that time is money and there is no reason to waste it. This is because the time will always be able to create money. When he has free time, he likes to stay active and to be in shape. He does different activities like dodge balls, waffle ball, rafting, rock climbing and carpentry.

When it comes to personal life, he is single and had not been married up to now. During the interviews, he says that he is yet to have a girlfriend since he is not dating any person. However, there are rumors that he may be dating fellow models and co-star. He never confirmed anything and he likes to keep his own life private away from the professional career. However, there are some people who doubt that at a certain level, he may be a gay. He is an active person on Facebook and on twitter. He has a large number of the followers on twitter and he likes to update his tweets on regular basis.