The late Hector-Neri Castaneda, the Mahlon Powell Professor of Philosophy at Indiana University, and founding editor of "Nous", has deeply influenced analytic indicators and quasi-indicators, and the proposition/practition theory. This volume collects 15 papers in ontology, philosophy of language, cognitive science and related areas by ex-students of Professor Castaneda, most of whom are now well-known researchers or even distinguished scholars. The authors share the conviction that Castaneda's work must continue to be explored and that his philosophical methodology must continue to be applied in an effort to further illuminate all the issues that he investigated. The topics covered by the contributions include intensional contexts, possible worlds, quasi-indicators, guise theory, property theory, Russell's substitutional theory of propositions, event theory, the adverbial theory of mental attitudes, existentialist ontology, and Plato's, Leibniz's, Kant's and Peirce's ontologies. An introduction by the editors relates all these themes to Castaneda's philosophical interests and methodology.