Pre-Modern Era, the Middle Ages, or Medieval period, lasted from the 5th to the 15th century
Modern Era 1500 thru 1900 -The term Mod-er-ni-ty applied to the cultural condition in which the necessity of innovation and more emphasis on reason becomes a primary fact of life, work and thought. Modernity appeared first in Europe in the 15th century and became dominant in the mid-19th century.
Post-Modernism 1900.. Postmodern philosophy is a philosophical direction which is critical of the foundational assumptions and universalizing tendency of Western philosophy and tends to emphasize the elusiveness of meaning and knowledge.
Stephen Hicks is a Canadian-American philosopher who teaches at Rockford University, where he also directs the Center for Ethics and Entrepreneurship.