He befriended Mark Twain. His father wrote The Scarlet Letter. He drank wine with Oscar Wilde, George Eliot and Henry James, and William Randolph Hearst once hired him as a reporter. He even published a few books to critical acclaim. So why do so few of us know anything about Julian Hawthorne? In the WaPo, Michael Dirda reviews a new biography. (h/t Arts and Letters Daily)