Franz Clemens Brentano. The German philosopher and psychologist Franz Clemens Brentano (1838-1917) is best known for his work in establishing psychology as an independent science. Franz Brentano was born on Jan. 16, 1838, at Marienberg in the Rhineland into a family of the nobility, whose lineage is traceable to the 13th century and includes.

Franz Clemens Brentano (1838–1917) is mainly known for his work in philosophy of psychology, especially for having introduced the notion of intentionality to contemporary philosophy. He also made important contributions to many fields in philosophy, especially to ethics, ontology, logic, the history of philosophy, and philosophical theology.