He coauthored Indians, Franciscans, and Spanish Colonization: The Impact of the Mission System on California Indians with Robert H. Jackson.
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After graduating in 1969, Castillo took a minority counseling position at the University of California, Santa Barbara.
Sergio Badilla Castillo | Bernal Díaz del Castillo | Roberto Castillo Sandoval | Montealegre del Castillo | Jaime Castillo Velasco | Celso Advento Castillo | Castillo de San Marcos | Castillo de la Real Fuerza | Antonio Cánovas del Castillo | Abelardo Castillo | Juan del Castillo | José Videla Castillo | José Chavéz y Castillo | Isabella Castillo | Francisco Castillo Fajardo, Marquis of Villadarias | Eliecer Castillo | El Castillo | Castillo de Teayo, Veracruz | Castillo de Teayo | Castillo de San Pedro de la Roca | Susan Castillo | Sergio Rogelio Castillo | Roberto Castillo (baseball) | Roberto Castillo | Pedro del Castillo | Otto René Castillo | Nery Castillo | Monteagudo del Castillo | Marino Vinicio Castillo | ''La Giradilla'' on the watchtower of the Castillo de la Real Fuerza |