Wilhelm Leibniz (1646-1716)

Wilhelm Leibniz was raised by his mother at a very early age, following the death of his father, a professor of philosophy. Leibniz became driven to academic success, apparently motivated at least in part by a desire to learn about his father by reading his published works. His early academic career centered on the study of philosophy, and he entered graduate school with the intention of practicing law. While his university training began at the age of 14, because of his interest in the law, he did not begin formal training in mathematics until he changed his academic focus to mathematics after he turned 25. This is unusual; most of mathematicians who go on to make significant advances express an interest in the subject at a much earlier age. As a young man, Leibniz focused much of his effort into designing, then building a mechanical calculating machine, which he planned to use to as an aide in his research. He was interested in the ongoing development of calculus, and is credited for the creation of the integral symbol. While Newton is commonly identified as the inventor of calculus, Leibniz' work has since proven to be more easily understandable, and more closely resembles the forms that we use today. His most lasting contribution is in the development of differential and integral calculus, although he also worked in number theory and applied physics and mechanics. Late in his life he apparently was very defensive about his role in the development of calculus, fending off occasional attacks from mathematicians who claimed that his work was pilfered from previously published results.