Greg's first career was in theatre as actor, director & writer. He has lived and worked in Paris, New York, Los Angeles and Madrid. Having worked as an interpreter at a variety of international institutions, in 2015 Greg returned to theatre. Since then, he has written and produced 25 plays and musicals. His debut novel, The Coming Darkness, was named Best Thriller 2022 by The Times and one of the Books of the Year by the Sunday Times. It was endorsed by big names like Lee Child and Anthony Horowitz. Greg is a regular on radio, including his appearance as a guest on BBC Radio 4 Front Row. He now lives in Sussex with his wife, the novelist Kate Mosse.