Probably his Special Theory of Relativity.
Evoloution
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Charles Darwin.
Karl Marx
Albert Einstein is credited with the theory that the speed of light is constant. He is also credited with stating the laws of physics exist everywhere.
Alfred Wegener is credited with proposing the theory of Pangaea, suggesting that the continents were once joined together in a single supercontinent that later drifted apart over millions of years. His theory laid the foundation for the modern theory of plate tectonics.
Isaac Newton can be credited with most famous for his laws of motion, theory of universal gravitation, and development of calculus. However, he cannot be credited with the invention of the telescope, which is typically attributed to Hans Lippershey.
Friedrich Ratzel is credited as the creator of the Organic Theory. He was a German geographer who also developed the concept of living space.
John Dalton
The Theory of Evolution has been evolving for many years. However, the person usually credited with its "creation" is Charles Darwin.
scientific method used in the development of atomic theory