Famous for his portrayal of twins Van and Jethro West in the hit New Zealand television series Outrageous Fortune, Starr is also known for his starring role as ex-con Lucas Hood in Cinemax's Banshee series. He is recognizable for playing the character Homelander on the popular TV show The Boys.
He entered the acting business in the 1990s, appearing in episodes of Xena: Warrior Princess and Shortland Street.
His role as Jeremy King in the 2012 Australian film Wish You Were Here earned him both a Film Critics Circle of Australia (FCCA) Award and an Australian Film Institute (AACTA) Award. He has amassed over 30 acting roles throughout his ongoing career.
He was born and raised in New Zealand. He is married to Lucy McLay. He has a pet dog.