Edward Albee and Oliver La Farge both won this award, one for a novel and one for a play?
Edward Albee Edward Franklin Albee III ( ; March 12, 1928 – September 16, 2016) was an American playwright known for works such as "The Zoo Story" (1958), "The Sandbox" (1959), "Who's Afraid of Virginia Woolf?" (1962), and "A Delicate Balance" (1966). Three of his plays won the Pulitzer Prize for Drama, and two of his other works won the Tony Award for Best Play.
Ronald Harwood Sir Ronald Harwood, CBE, FRSL (born Ronald Horwitz; 9 November 1934) is an author, playwright and screenwriter. He is most noted for his plays for the British stage as well as the screenplays for "The Dresser" (for which he was nominated for an Oscar) and "The Pianist", for which he won the 2003 Academy Award for Best Adapted Screenplay. He was nominated for the Best Adapted Screenplay Oscar for "The Diving Bell and the Butterfly" (2007).