Selway worked with a number of renowned directors over three decades, including Steven Spielberg, Roman Polanski, Clint Eastwood, John Boorman, Sydney Pollack, Robert Altman, Michael Apted, Nicolas Roeg, Fred Schepisi, Fred Zinnemann and Ridley Scott.

[7] Selway was always seeking new acting talent, watching films from all over the world and attending fringe theatre performances.

It is directed by Isabelle Gregson, who explained that it aims "in its own small way to give those who didn't have the pleasure of knowing her, a taste for her enormous contribution to Cinema through the eyes and words of those who knew and loved her.

"[7] The British Academy of Film and Television Arts (BAFTA) Orange Rising Star Award for the best young actor is dedicated to the memory of Mary Selway.

She directed the casting of many well-known films, including: Selway was married to the actor Norman Rodway in January 1966.