Original: Werner Heisenberg (5 December 1901 – 1 February 1976) was a German theoretical physicist who made foundational contributions to quantum mechanics and is best known for asserting the uncertainty principle of quantum theory.
Simplified: Werner Karl Heisenberg (December 5, 1901 - February 1, 1976) was a German physicist, Nobel Prize winner and one of the people who started a new area of physics called quantum mechanics.