Mark Twain (1835–1910) was born Samuel Langhorne Clemens in Florida, Missouri. Starting out as typesetter, he went on to work as a steamboat pilot, prospector, and journalist before publishing his first major book, The Innocents Abroad.

R. Kent Rasmussen is the author or editor of nine books on Mark Twain, including the award-winning Mark Twain A to Z, as well as more than a dozen other books. He lives in Southern California.