Einstein is by far the most famous scientist of the 20th century, and quite probably the best. In my opinion it is no coincidence that from a philosophical standpoint he was also more inclined towards materialism than just about all the well-known physicists of his day, most of whom were wallowing in philosophical idealism up to their eyeballs. But it is his philosophical views of space and time arising from his special and general theories of relativity that have most intrigued philosophers and the public alike.
See also: COSMOLOGY; NEWTON [Squire]