Who Really Founded It: Founders and Systematizers Across Seven Traditions

The traditional author of the Brahma Sutras, the founding text every later school of Vedanta is required to write its own commentary on. This atlas records Badarayana as the one who founded Vedanta as a school; his own dates remain among the most unsettled in Indian philosophy.

Wrote the earliest complete extant commentary on Badarayana's Brahma Sutras and gave Advaita, the reading that self and Brahman are strictly identical, its classical systematic form. The Stanford Encyclopedia of Philosophy's own framing, followed here, calls him Advaita's systematizer rather than Vedanta's founder.

Studied under Confucius's own grandson and argued human nature is fundamentally good, its virtues present as underdeveloped sprouts that ripen through reflection rather than external compulsion.

Wrote an essay directly attacking Mencius's claim, arguing human nature inclines toward disorder and that goodness is never innate but achieved, wei, through deliberate cultivation by ritual and education.

Succeeded Cleanthes as head of the Stoa around 230 BCE and is credited by ancient tradition as its second founder, prompting the saying that without Chrysippus there would have been no Stoa. He built Stoic logic into a rigorous deductive system.

Roman emperor from 161 to 180 CE who kept a private notebook, later called the Meditations, during his final years on campaign, and names the freed slave Epictetus as the Stoic teacher whose writings shaped him most directly.

Regarded as the founder of the school later called Neoplatonism, though he considered himself simply an expositor of Plato. He organized reality into a hierarchy descending from the One, an utterly transcendent first principle beyond being itself.

Pushed Kant's transcendental idealism toward a fully systematic idealism grounded in a single first principle, the self-positing activity of the I, in his 1794 Wissenschaftslehre. His Jena lectures shaped Schelling and, through Schelling, Hegel.

Founded phenomenology as both a philosophical method and a movement with the Logical Investigations of 1900 to 1901, proceeding by the epoche, a deliberate bracketing of whether an experienced object exists in order to describe how it is given to consciousness.

Reconceived logic from the ground up in the 1879 Begriffsschrift, building the first rigorous predicate calculus, and aimed to derive arithmetic from logic alone, an ambition set back when Bertrand Russell showed his system permitted the contradiction now called Russell's paradox.