This document provides a timeline of the lives and careers of two famous American authors, Washington Irving and Mark Twain. It outlines the major events in their lives, including Irving's early literary works in the 1800s that established him as the first American literary celebrity. It also details Twain's upbringing in Missouri, career as a riverboat pilot, travels out West, breakthrough short story "The Celebrated Jumping Frog of Calaveras County," marriage, and establishment as a famous author with works like The Innocents Abroad.