 An architectural historian and design instructor, Castro wrote that his goal was to convey "both the theortical and pragmatic aspects in a holistic way".Influenced by the work of architects Juhani Pallasmaa and Peter Zumthor and colleagues Alberto Perez-Gomez and Robert Mellin, Castro used the Greek term "sýndesis" to convey both the "tangible and conceptual" in monographs on Canadian architect Arthur Erickson and Colombian architect Rogelio Salmona.A concern with "urban topography", or architecture within its environment, is central to his analysis of the Hispanic Baroque.