Nice description of storytellers at the School of Storytelling at Emerson College in the UK:
A storyteller is more than just a teller of stories. Storytellers are entertainers, teachers and healers with a long spiritual tradition. Their creative work often focuses on strengthening the communities in which they live. Drawing on the richness of the oral tradition, storytellers are bridge builders that connect us to other people, to ourselves, and to the invisible world of the imagination.