Leo is a 6-year-old boy who is the the Little Einsteins leader and (along with June) the oldest of the Little Einsteins members. He pilots Rocket. He is the older brother of Annie and his main talent is conducting. His most precious object is his father's Conductor Baton. He uses the baton to conduct the music to the right beat as well as he can use his conducting moves like Crescendo, Diminuendo and more. His full name is Leonardo and prefers to call himself Leo for short.