It was a very great pleasure to talk to A. Scott Berg, whose college paper about editor Maxwell Perkins became the first of his many distinguished biographies of 20th century Americans. Berg was the first to read the just-donated collection of papers from the publisher of books by Hemingway, F. Scott Fitzgerald, Thomas Wolfe, and many others, discovering correspondence that showed the influence Perkins had on some of the greatest works of American literature. The new movie, "Genius," starring...