What’s it like to discover you’ve been sitting on Mark Twain’s last major literary work without realizing it? Robert Hirst, General Editor of the Mark Twain Project, describes the feeling in this interview with the National Endowment for the Humanities, a major funder of the Project and the Autobiography.

Hirst discusses the immense challenge of producing an authoritative text from Mark Twain’s abundant papers; the rich, funny content of his letters, many of which are still coming to light; and the comments so radical Mark Twain hoped to wait 500 years to reveal. Watch the video below.