Albert Einstein, a German physicist, advocated for world peace during a time when militarism was dominant, particularly during World War II, and opposed the use of atomic bombs. His contributions to science, especially the theory of relativity and the mass-energy equivalence formula E=mc², have left a profound impact on the field of physics and beyond. Despite initial struggles in academia and societal resistance, Einstein's ideas eventually reshaped scientific understanding and influenced global perspectives on peace and conflict.