Matthew Brown Director, Screenwriter, Producer Dev Patel Srinivasa Ramanujan Actor Jeremy Irons G.H. Hardy Actor Devika Bhise Janaki Actor Kevin R. McNally Major McMahon Actor Jeremy Northam Bertrand Russell Actor Anthony Calf Howard Actor Arundathi Nag Komalatammal Actor Richard Johnson Vice Master Henry Jackson Actor Raghuvir Joshi Narasimha Actor Dhritiman Chatterjee Narayana Iyer Actor Padraic Delaney Beglan Actor Roger Narayan Scribe Actor Stephen Fry Sir Francis Spring Actor Toby Jones Littlewood Actor Edward R. Pressman Producer Jim Young Producer Joe Thomas Producer Sofia Sondervan Producer Jon Katz Producer Masaaki Tanaka Executive Producer Phil Hunt Executive Producer Compton Ross Executive Producer Mark Montgomery Executive Producer Larry Smith Cinematographer JC Bond Film Editing Luciana Arrighi Production Design Andrew Munro Supervising Art Direction Justin Warburton-Brown Art Director Liz Ainley Set Decoration Ann Maskrey Costume Design