Originally a Catholic priest, Brentano withdrew from the priesthood in 1873 due to the dogmatic definition of papal infallibility in Pastor aeternus. Working subsequently as a non-denominational professor, his teaching triggered research in a wide array of fields such as linguistics, logic, mathematics and experimental psychology through the young generation of philosophers who were gathered as the School of Brentano.
^Robin D. Rollinger, Austrian Phenomenology: Brentano, Husserl, Meinong, and Others on Mind and Object, Walter de Gruyter, 2008, p. 7.
^Gestalt Theory: Official Journal of the Society for Gestalt Theory and Its Applications (GTA), 22, Steinkopff, 2000, p. 94: "Attention has varied between Continental Phenomenology (late Husserl, Merleau-Ponty) and Austrian Realism (Brentano, Meinong, Benussi, early Husserl)".
^Robin D. Rollinger, Austrian Phenomenology: Brentano, Husserl, Meinong, and Others on Mind and Object, Walter de Gruyter, 2008, p. 114: "The fact that Brentano [in Psychology from an Empirical Standpoint] speaks of a relation of analogy between physical phenomena and real things existing outside of the mind obviously indicates that he is a realist and not an idealist or a solipsist, as he may indeed be taken to at first glance. Rather, his position is a very extreme representational realism. The things which exist outside of our sensations, he maintains, are in fact to be identified with the ones we find posited in the hypotheses of natural sciences."
^Biagio G. Tassone, From Psychology to Phenomenology: Franz Brentano's 'Psychology from an Empirical Standpoint' and Contemporary Philosophy of Mind, Palgrave Macmillan, 2012, p. 307.
^Franz Brentano: Psychologie vom empirischen Standpunkt. Ed. Oskar Kraus, 2 vols. Leipzig: Meiner, 1924–25; ed. Mauro Antonelli. Heusenstamm: Ontos, 2008
^Robin D. Rollinger, Husserl's Position in the School of Brentano, Phaenomenologica 150, Dordrecht: Kluwer, 1999, Chap. 2: "Husserl and Bolzano", p. 70.