Who is Mark Twain from Tesla, Man Out of Time and what is their importance?

Mark Twain is credited by Nikola Tesla as having saved his life. How this occurred is quite strange. Nikola was sickly as a boy. He was desperate for ways to feel better and get healthy again. He discovered the works of Mark Twain.

Later, the inventor met Mark Twain. The American novelist is mentioned in chapters one and two. In the first chapter, Twain visits the younger man's electricity laboratory. In the second, Twain's writings are mentioned as playing a vital role of the young Nikola's recovery from sickness.