Which novelist wrote more film scripts, James Dalton Trumbo or Philippa Gregory?
Dalton Trumbo: James Dalton Trumbo (December 9, 1905 – September 10, 1976) was an American screenwriter and novelist, who scripted films including "Roman Holiday", "Exodus", "Spartacus", and "Thirty Seconds Over Tokyo". Philippa Gregory:  The best known of her works is "The Other Boleyn Girl" (2001), which in 2002 won the Romantic Novel of the Year Award from the Romantic Novelists' Association and has been adapted into two separate films.
James Dalton Trumbo