Bertrand Russell 
Our Knowledge of the External World as a Field for Scientific Method in Philosophy [EPUB ebook] 

British philosopher Bertrand Russell made a number of significant contributions to the field, including helping to found the area of inquiry known as analytical philosophy and advancing the practice of logic. He also helped to influence the development of the philosophy of science by focusing on empiricism in new ways. The underpinnings of Russell’s views on science and metaphysics are set forth in Our Knowledge of the External World as a Field for Scientific Method in Philosophy.