FTP, name this American author who won a Pulitzer Prize for Andersonville.
He wrote a janitor who watches a high-school graduation in Valedictory, while he wrote about a dog in The Voice of Bugle Ann.  His poetic works include Turkey in the Straw and a verse novel about three discharged soldiers, Glory for Me, which became the basis of the movie The Best Years of Our Lives.  He wrote about gangsters in Chicago in his first novel, Diversey, while his historical fiction includes a novel about Gettysburg, Long Remember, and such period novels as The Romance of Rosy Ridge and Arouse and Beware.  He also wrote Spirit Lake and Valley Forge, but is best known for a 1955 novel about a prison.  FTP, name this American author who won a Pulitzer Prize for Andersonville.
He wrote a janitor who watches a high-school graduation in Valedictory, while he wrote about a dog in The Voice of Bugle Ann.  
MacKinlay Kantor