Diogenes Laertius
Book I - The Seven Sages
Book II - Socrates, predecessors, followers
Book III - Plato
Book IV - The Academics
Book V - The Peripatetics
Book VI - The Cynics
Book VII - The Stoics
Book VIII - Pythagoreans
Book IX - Others (Eleatics, Atomists, Skeptics, etc.
Book X - Epicurus