One of this man's theories claims that judgements, which form the basis of knowledge, are reached by determining the existence of a presented object. One of his students wrote a work claiming that the essence of music was consonance, Questions of Music, while another wrote a book whose first volume, Prolegomena to Pure Logic, is a strong attack on psychologism. In addition to his theory of judgement advanced in Psychology from an Empirical Standpoint, another one of his 
One of this man's theories claims that judgements, which form the basis of knowledge, are reached by determining the existence of a presented object. One of his students wrote a work claiming that the essence of music was consonance, Questions of Music, while another wrote a book whose first volume, Prolegomena to Pure Logic, is a strong attack on psychologism. In addition to his theory of judgement advanced in Psychology from an Empirical Standpoint, another one of his theories sought to distinguish a mental kind of action from a physical one by claiming that mental phenomenons had an object at which they are directed, a claim expanded on by his student's work Logical Investigations. For 10 points, who is this man who taught Carl Stumpf and Edmund Husserl and introduced the concept of intentionality in his Descriptive Psychology, a German philosopher.
One of this man's theories claims that judgements, which form the basis of knowledge, are reached by determining the existence of a presented object.
Franz {Brentano}