Max Planck was a German physicist born in 1858 who made several seminal contributions to physics and the development of quantum theory. Some of his major achievements included publishing papers that established quantum theory and defined Planck's constant, which established the quantization of energy that was a revolutionary development in physics. He also studied black body radiation and established Planck's law of black-body radiation. The Max Planck Institute was established in his honor and continues important research in fields of science today.