About Willy Yépez Álvarez Willy Yépez Álvarez, an archaeologist specializing in the Pre-Columbian cultures of southern Peru, is coeditor of Tenahaha and the Wari State: A View of the Middle Horizon from the Cotahuasi Valley. Books by Willy Yépez Álvarez Quilcapampa A Wari Enclave in Southern Peru edited by Justin Jennings, Willy Yépez Álvarez & Stefanie L. Bautista