Known best for his role as Eddie Carlson on the Jim Henson live action series Me and My Monsters, Keeper also appeared in the miniseries The Missing and contributed as a voice actor to the animated series Charlie and Lola.
Early in his childhood acting career, he appeared in a 2011 episode of Little Crackers.
According to his Twitter profile, he performed in a production of Oliver the Musical.
He spent his childhood in England and Australia and attended the D&B School of Performing Arts in London.
He and Australian child actress Ivy Latimer were both in the cast of Me and My Monsters.