Gregg Chillin was born in 1988 in Cambridge. His parents were of Armenian and English descent. At the age of 11 Chillin got his first professional job. He was portraying a football player in an advertisement of a drink.
Chillin currently plays Zoroaster in David S. Goyer American series Da Vinci's Demons.
Chillin has appeared in many television shows such as BBC One's Inside Men, Waking the Dead and Zen playing the character of Pepe Spadola alongside Rufus Sewell.
He provided the voice of Ron Weasley in several of the Harry Potter Video Games.
Chillin made his stage debut at the Royal National Theatre playing Mark in Dennis Kelly's DNA in 2008.