His name is synonymous with "genius," but these essays by the renowned physicist and scholar are accessible to any reader. In addition to outlining the core of relativity theory in everyday language, Albert Einstein presents fascinating discussions of other scientific fields to which he made significant contributions. The Nobel Laureate also profiles some of history's most influential physicists, upon whose studies his own work was based. Assembled during Einstein's lifetime from his speeches and essays, this book marks the first presentation to the wider world of the scientist's accomplishments in the field of abstract physics. Along with relativity theory, these articles examine the methods of theoretical physics, principles of research, and the concept of scientific truth. Einstein's speeches to audiences at Columbia University and the Prussian Academy of Science appear here, along with his insightful observations on such giants of science as Johannes Kepler, Sir Isaac Newton, James Clerk Maxwell, Niels Bohr, Max Planck, and others.