Colin Firth and Michael Fassbender will star in "Genius," directed by Michael Grandage, with Film Nation handling international sales, the company announced on Thursday.

Based on A. Scott Berg's biography "Max Perkins: Editor of Genius," the tells the story of the relationship between Thomas Wolfe (Fassbender) and editor Max Perkins (Firth), the screenplay is written by John Logan.

"Genius" will be produced by James Bierman for the Michael Grandage Company, launched at the end of 2011 by Grandage, the former artistic director of London's Donmar Warehouse. Bierman served as executive producer at Donmar and co-formed MGC with Grandage. MGC is  producing Logan’s new play, “Peter and Alice,” to be directed by Grandage, as part of a season of plays in London in Spring 2013.

FilmNation is selling the film at the AFM. CAA will arrange the financing and represent the film's North American distribution rights. Principal photography is scheduled to start early in 2014.