Isaac Barrow (October 1630 – May 4, 1677) was an English scholar an mathematician who is generally given credit for his early role in the development of calculus; in particular, for the discovery of the fundamental theorem of calculus. His work centered on the properties of the tangent; Barrow was the first to calculate the tangents of the kappa curve. Isaac Newton was a student of Barrow's, and Newton went on to develop calculus in a modern form. Lunar crater Barrow is named after him.