Isaac Newton was an English physicist, mathematician, astronomer, natural philosopher, alchemist, and theologian. He is widely recognized as one of the most influential scientists of all time and as a key figure in the scientific revolution. His work on the laws of motion and universal gravitation laid the foundations for classical mechanics. He also made seminal contributions to optics, and shares credit with Gottfried Leibniz for developing the infinitesimal calculus. Newton's alchemical pursuits were part of his broader investigations into the natural world. He sought to understand the relationship between matter and energy, and to uncover the secrets of transmutation. He believed that the philosopher's stone, a mythical substance that could turn base metals into gold, was real and attainable.