Discussing theory of relativity.
Albert Einstein
03/14/1879 - 04/18/1955

Albert Einstein (March 14, 1879 – April 18, 1955) was a German-born theoretical physicist.

He is best known for his theory of relativity and specifically mass-energy equivalence, E = mc2. Einstein received the 1921 Nobel Prize in Physics "for his services to Theoretical Physics, and especially for his discovery of the law of the photoelectric effect."

Einstein's many contributions to physics include his special theory of relativity, which reconciled mechanics with electromagnetism, and his general theory of relativity which extended the principle of relativity to non-uniform motion, creating a new theory of gravitation.