**Acknowledgements**

I gratefully acknowledge the support of the U.S. National Science Foundation, for funding the many seasons of excavation, analysis, and publication of our Cerén research project. The generosity and helpfulness of the Salvadoran rural poor people have been a testimony to their core of humanity, and all project members wish to acknowledge this. Therefore, we took pleasure in giving back to them, with a UNESCO World Heritage site in their neighborhood. Karoly Nemeth's comments improved the text of this chapter.

*Updates in Volcanology – Transdisciplinary Nature of Volcano Science*
