Finneas O’Connell, also known mononymously as Finneas, is an American actor, musician, and music producer. Finneas is most known for his work with his sister Billie Eilish through producing and performing together. O’Connell initially starred as Shane in the independent film Life Inside Out. He is also known for his role as Alistair in the Fox TV series Glee. In 2011, he portrayed Spencer in the film Bad Teacher. He also had a recurring role on ABC’s Modern Family and appeared in two episodes of Aquarius. Most recently he has been putting out his own original music. Since then he is starting to pave his own lane and releasing his own music.