Mark Twain: A Biography - Volume II - Albert Bigelow Paine

Until recently, this work has been considered the "go-to" bio of Mark Twain. Albert Bigelow Paine (July 10, 1861 – April 9, 1937) was an American author and biographer best known for his work with Mark Twain. This recording of Paine's exhaustive biography covers Twain's personal and literary life in detail, heretofore unapproached. - Summary by John Greenman and Wikipedia