Albert Einstein is the discoverer of the law of photoelectric effect.
Albert Einstein . He received the 1921 Nobel Prize in Physics `` for his services to theoretical physics , and especially for his discovery of the law of the photoelectric effect '' , a pivotal step in the evolution of quantum theory . In 1922 , Albert Einstein was awarded the 1921 Nobel Prize in Physics , `` for his services to Theoretical Physics , and especially for his discovery of the law of the photoelectric effect '' .