Julio Herminio Pimienta Explains that Epistemology or Theory of Knowledge, is the knowledge and object of study of philosophical and scientific discipline.

Mario Bungue Affirms that epistemology is not above or below science,

Rene Descartes ( 1596- 1650) Said “everything that helps the rationality of the subject is the foundation of knowledge.”

John Locke ( 1632- 1704 ) Studied medicine and chemistry, he affirmed that everything we think and know is the result of our experience.

David Hume ( 1711- 1776) Current symbol of empiricism, show that reason isn’t enough to know.

Francis Bacon ( 1561- 1626 ) Enunciated a very self-explained metaphor that help us understand a paradox.

German Karl Marx ( 1818- 1883 ) Speaks of the natural reality that address the experimental science, also the social reality that address the humanistic & social science.

Empedocles of Agrigento (495-444 BC) The inductive and deductive through as intuition, convince himself that nothing can originate from nothing and what exists can not disappear.

Aristoteles ( 384- 322 BC ) Devised and recorded the first classification of living beings.

Claudius Ptolemy ( 85-165 BC ) Egyptian who improved during the Roman Empire, the Aristotelian system to make observations to better understand distance between the spheres of celestial bodies.