Mark Twain was an early American author whose image was about as well known as his writing. Here's a collection of illustrations featuring Twain's likeness, which were incorporated into various editions of his books.
Interested in what other Twain enthusiasts have to say? Check out TwainWeb, a forum that includes some useful links, including one to resources for student research.
For an historical footnote to this author's life, read this obituary of Absalom Grimes, who served in the same company with Twain during the Civil War.
This is the homepage of the PBS site for the Ken Burns documentary Mark Twain. There, you'll find photos, an interactive scrapbook, and links to a chronology and selected writings.