Oh no Planck wasn't a biologist - he was a physicist. Planck was born in Kiel on April 23th 1858, and educated at the universities of Munich and Berlin. In 1900 Planck postulated that energy is radiated in small, discrete units, which he called quanta. Developing his quantum theory further, he discovered a universal constant of nature, which is known as Planck's constant. His discoveries did not, however, supersede the theory that radiation from light or matter is emitted in waves. Physicists now believe that electromagnetic radiation combines the properties of both waves and particles. Planck's discoveries, which were later tested and confirmedby other scientists, were the basis of an entirely new field of physics, known as quantum mechanics, and provided a foundation for research in such fields as atomic energy. Planck received the 1918 Nobel Prize in physics. In 1930, he was elected president of the Kaiser Wilhelm Society for the Advancement of Science, which was later renamed the Max Planck Society. He openly critiscised the Nazi regime and was forced out of the society, but became president again after World War II. He died at Gottingen on October 4th, 1947.