The Chicago Tribute reports that John Shiban, Doris Egan, Jane Espenson and John Fay will all write episodes for the show's upcoming fourth series.
Shiban has previously written for both The X-Files and Supernatural. His most recent work was on AMC drama Breaking Bad. Egan has penned several episodes of House and has also worked on Smallville and Dark Angel.
Jane Espenson wrote for both Buffy The Vampire Slayer and its spinoff Angel. She has also written episodes of Battlestar Galactica and prequel series Caprica. John Fay is the only writer to have previously worked on Torchwood, scripting the second and fourth episodes of third series Children of Earth.
Russell T. Davies previously admitted that he was unsure how many episodes of the series he would be writing himself.
Torchwood: The New World will air on Starz in the US and on BBC One in the UK.