|Except for a nine-year period in which he was employed as a tutor throughout Eastern Prussia, Immanuel Kant spent the majority of his life learning and teaching in the Pietist town of Konigsberg, Germany. Kant's life aside of his work was rather uneventful; he never married and traveled little. The young Kant was educated by Pietists--part of a 17th-century German Lutheran religious movement which stressed personal piety over formal religion. He later studied under the guidance of followers of philosopher-mathematicians Gottfried Liebniz and Christian Wolff, and he was also influenced by the work of Sir Isaac Newton and Jean Jacques Rousseau. In 1755, Kant received his master's degree at the University of Konigsberg, and he went on to teach physics, math, philosophy, and other subjects there. By 1770, when he became department chair and professor of logic and metaphysics, Kant already had a distinguished reputation within German intellectual circles. During this year, he began his most significant work, the "Critique of Pure Reason", which would be published years later. In it, Kant explored his major preoccupation: how to defend the authority of science while maintaining morality and reason. The sheer enormity and depth of Kant's undertaking partly explains why his works are widely perceived as intimidating, complex, and all but inpenetrable to all but advanced students of philosophy. Nevertheless, few people have written as many significant texts in the history of philosophy as Kant, who expounded upon such topics as the basis of knowledge, God, freedom, religion, ethics, law, and aesthetics. Kant was also the first of the major philosophers to spend his life teaching the discipline.