Albert Einstein

Albert Einstein was a theoretical physicist and author whose work reshaped the scientific understanding of space, time, light, gravity, and matter. Relativity The Special and General Theory is a direct book-length introduction to the two theories associated with his name, written to make their central ideas accessible beyond specialist readers. Relativity and Relativity The Special and the General Theory are alternate editions of that core work rather than separate stages of his thought. Sidelights on Relativity gathers lectures that clarify questions around ether, geometry, and the relation between space and gravitation. Relativity The Special and General Theory provides the coherent starting point; Sidelights on Relativity then offers a shorter companion for readers who want to examine particular conceptual problems in greater detail.