Who is the physicist known for his contributions to both relativity and the photoelectric effect?

Albert Einstein is renowned for his groundbreaking contributions to physics, particularly his theories of relativity and his work on the photoelectric effect. His theory of special relativity, published in 1905, introduced revolutionary concepts about the nature of time and space, fundamentally altering our understanding of physics. Additionally, Einstein's explanation of the photoelectric effect, also in 1905, provided crucial evidence for the existence of photons and laid the groundwork for quantum theory. This work demonstrated how light can behave as both a wave and a particle, which was pivotal in advancing the field of quantum mechanics. Consequently, Einstein's dual contributions to these significant areas of physics underscore his importance in the discipline.