Who wrote 'Life on the Mississippi'?

Mark Twain, pseudonym of Samuel Langhorne Clemens: American humorist, journalist, lecturer, and novelist who acquired international fame for his travel narratives, especially:

- The Innocents Abroad (1869),
- Roughing It (1872), and
- Life on the Mississippi (1883),

and for his adventure stories of boyhood, especially:
- The Adventures of Tom Sawyer (1876) and
- Adventures of Huckleberry Finn (1885).

Source: britannica