Which recurring figure in the way to rainy mountain was a 19th century anthropologist who provides much of the information presented in the historical sections?

The recurring figure that appears in several parts of this writing, actualy in the second parts of several sections, is a person called "Mooney" which in itself is the anthropologist known as James Mooney  who lived for several years with the cherokee tribe. It is interest to note that he became a self-taught expert on American tribes by his own studies