Who is Franz Brentano and why should a cognitive scientist care? Perhaps the question could be reframed. Who, in 1874, published what was considered to be the most important text [1] in the development of experimental psychology alongside Wundt's Principles of Physiological Psychology [2]? Who can rightfully be considered the forefather of Gestalt psychology and phenomenology? Who influenced the development of logic and analytic philosophy? Whose thinking found its stamp, directly or indirectly, in a range of work by noted philosophers, psychologists and logicians, including Edmund Husserl, Ernst Mach, Bertrand Russell, Alfred Tarski, William James, Christian von Ehrenfels and Kurt Koffka? In her book Immanent Realism: An Introduction to Brentano, Liliana Albertazzi suggests that this sometimes dubious legacy might have rendered Brentano, arguably the greatest thinker of his time in the philosophy of psychology, relatively neglected in contemporary cognitive science.