He has toured the USA with Peter Hall's production of As You Like It and Mill On The Floss. An extensive theatre career has included playing leading roles at the National Theatre, the Royal Shakespeare Company (where he is an associate artist), at the Royal Court, the Old Vic, Almeida, Donmar Warehouse in the West End and at most leading London theatres, he won the UK Theatre award for best performance in a play for The Rover at the RSC. He is known for long running stints in TV shows such as The Last Kingdom (Netflix), Banished (BBC), 24 - Live Another Day (Fox), Holby City (BBC), The Sarah-Jane Adventures (BBC), Peak Practice (ITV), Campus (Channel 4), Moonknight (Marvel), Penny dreadful (Sony), Van Der Valk (ITV), Catch 22 (Hulu), Survivors (ITV), Ransom (CBS) among over forty other TV credits. Joseph's extensive work in feature films has included leading roles in Angel Has Fallen, Casino Royale, I Give It A Year, Dragonheart Vengeance, The Dead 2, All The Devil's Men, Creation Stories, Tango One, Prancer A Christmas Tale among nearly twenty others.