Rathbone was born in Singapore and has lived from places ranging from Indonesia to Midland, Texas. He started out in local theatre, The Pickwick Players. In high school, he went to Interlochen, a private school for the arts in Michigan. After graduation, he had planned to go to the Royal Scottish Academy but went to LA to experiment with the big screen. He lived with his high school mate and best friend, Alex Boyd. He immediately signed onto Disney's 411. He had a leading role in the ABC Family show Beautiful People, which premiered in fall 2005 and the second half of the first season began in spring 2006.