Born and raised in Whangarei, New Zealand, Milo Cawthorne developed a love for acting at a young age and participated in several productions in the local community theatre. But his talents took him further than just his hometown as he began appearing in several children's television shows, even starring in "P.E.T. Detectives" (2003) as Evan. Still, he made his home on stage and even performed as part of New Zealand's Young Shakespeare Company at the Globe Theatre in London.

After unsuccessfully attempting to enroll in drama school and working as a pizza delivery boy for about a year, Cawthorne landed the role of bumbling ex-cartel member Ziggy Grover, Ranger Operator Series Green, on "Power Rangers RPM" (2009), which gave him exposure to a much larger audience than what he had been used to. Following this, he returned to the stage and participated in several theatre productions, including "The History Boys" (2009) with the Peach Theatre Company, and "360" (2010) for the New Zealand International Arts Festival. He also appeared in an episode of the miniseries "Underbelly NZ: Land of the Long Green Cloud" (2011).

In late 2011, Cawthorne moved to Los Angeles, California to begin filming the independent horror feature "Blood Punch" (2013), which premiered at the 20th annual Austin Film Festival in October 2013 and won the Audience Award in the Dark Matters horror/thriller category. He has also appeared in several short films, including "Andy" (2011), "Mae and Ash" (2012), and "I Love L.A." (2013).

Since then, Cawthorne has moved back to New Zealand and reprised his role as Young Gee in "360: A Theatre of Recollections" (2014). He will soon appear in a leading role in the New Zealand-produced television miniseries "When We Go To War" (2014), as well as the Auckland Theatre Company production of "Once On Chunuk Bair" (2014).