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.
Werner Heisenberg was born on December 5, 1901 and died on February 1, 1976.  He was a theoretical physicist and a founder of quantum mechanics.  He is best known for the uncertainty principle of quantum theory.