He is best known for his roles as Douglas 'Ca$h' Piggott on the Netflix comedy drama Heartbreak High, and Jett James on Australian Soap Opera Home and Away.
He studied drama there and played a major role in the school production of The Government Inspector.
[3] In April 2012, McDonald was cast as Jett James, a delinquent teenager, in Australian soap opera Home and Away.
[5] In November 2021, McDonald was cast in the Netflix comedy drama Heartbreak High as Douglas "Ca$h" Piggott.
[8] In September 2024, Williams was announced to star in the Joanna Murray-Smith penned adaptation of The Talented Mr. Ripley at Sydney Theatre Company in 2025.