Thomas E. Mails was a painter, illustrator and writer. Mails spent years writing and illustrating Native American history books. The first book he began work on was titled The Mystic Warrior of the Plains. The book was illustrated by Mails himself and was published by Doubleday and Company in 1972 and is now in its eighth printing. The Mystic Warriors of the Plains has become a standard reference book the world over for those interested in the culture of the Plains Indians.