A History of western Philosophy
P63:
Anaxagoras is side to have been of the school Anaximenes;certainly he kept alive the rationalist and scientific tradition of the Ionians.One does not find in him the ethical and religious preoccupations which, passing from the Pythagoreans to Soctates and from Socrates to Plato, brought obscurantist bias into Greek philosophy. He is not quite the first rank, but he is important as the first to bring philosophy to Athens, and as one of the influences that helped to form Socrates.