Who is Alexander Simpson Smith from Pretties and what is their importance?

Alexander Simpson Smith is the holy man in a primitive village that Tally accidentally comes across in the woods. Alexander can speak Tally's language, therefore he becomes her guide. Alexander tells Tally a great deal about his people and their way of life. This leads Tally to realize that Alexander and his people are an experiment by doctors in the city who use them as guinea pigs for the pretty surgery.