James Clerk Maxwell (1831 - 1879) was a Scottish mathematical physicist. His most notable achievement was to formulate the classical theory of electromagnetic radiation, bringing together for the first time electricity, magnetism, and light as manifestations of the same phenomenon. Maxwell's equations for electromagnetism have been called the "second great unification in physics" after the first one realized by Isaac Newton. Maxwell demonstrated that electric and magnetic fields travel through space as waves moving at the speed of light (A Dynamical Theory of the Electromagnetic Field in 1865). The unification of light and electrical phenomena led to the prediction of the existence of radio waves.
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