Immanuel Kant (1724–1804) stands as a central figure in modern philosophy, who synthesized early modern rationalism and empiricism, set the terms for much of nineteenth and twentieth-century philosophy, and continues to exercise a significant influence today in metaphysics, epistemology, ethics, political philosophy, aesthetics, and other fields. His most significant contributions lie in his critical philosophy, particularly the 'Critique of Pure Reason' (1781), 'Critique of Practical Reason' (1788), and 'Critique of Judgment' (1790), collectively known as 'Kant's Three Critiques'. In these seminal works, Kant sought to establish the limits and scope of human understanding, the foundations of human morality, and the aesthetics of judgment. He is often associated with the doctrine of transcendental idealism, which posits that our experience of reality is shaped by the mind's innate structures. Through his moral philosophy, Kant developed the concept of the categorical imperative, a principle suggesting that one should only act according to that maxim whereby you can, at the same time, will that it should become a universal law. His work has been profoundly analytical and critical, setting the stage for the development of various philosophical movements, such as German Idealism and Phenomenology. Kant's influence permeates a range of philosophical discourses and his ideas continue to be a point of reference in debates about deontological ethics, the theory of knowledge, and aesthetics among others.