Albert Einstein was born on the 14th of March 1879 and he died on the 18th of April 1955 at 76 years old. He is well known for his general theory of relativity, which is one of greatest theories created, and is a keystone for modern physics and Quantum Mechanics. He is also well known for his equation E=mc² (Energy=Mass x Speed of light squared). He won a Nobel Prize in 1921 for his "services to theoretical physics). Albert Einstein is regarded as being a genius and one of the greatest scientists ever.