  There is a large group of analytic philosophers in the area of Rio de Janeiro, including Oswaldo Chateaubriand, who works in philosophy of logic, metaphysics, and philosophy of language, and contributed to topics such as logical form, syntax, grammar, logical truth, theory of descriptions, theories of truth, modalities and  counterfactuals.[31] Other analytic philosophers working in Rio include Danilo Marcondes Filho (philosophy of language, epistemology, skepticism), Wilson Mendonça (philosophy of mind, ethics, and metaethics) and Maria Clara Dias (ethics, philosophy of action and mind).