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Isaac Newton
Newton, born in England in 1642 on Christmas Day, was one of the two greatest physicists of all time (Einstein is the other). He unified terrestrial and celestial dynamics with universal laws that were formulated mathematically. He brought together Galileo's mechanics and Kepler's laws of planetary motion. His discoveries include the principles of the differential and integral calculus, a theory of gravitation and the spectrum of light. His most famous book is his Mathematical Principles of Natural Philosophy.