He became interested in acting during his teenage years whist studying at Harrow School and eventually moved to New York City.

[4] In 2014, he was cast as CIA intelligence analyst Jordan Reed in FOX limited event television series 24: Live Another Day.

[5] He also appeared in the CBS drama series NCIS playing Daniel Budd,[6] a young man who is the leader of the terrorist group, the Calling.

He landed a recurring role in the sixth season of the fantasy-drama series Once Upon a Time, portraying the grown-up version of Belle and Rumplestiltskin's newborn son Gideon.

[7] In January 2023, Matthey announced his engagement to English entrepreneur Gabrielle Jones after four years of dating.