Isaac Barrow was an English mathematician and theologian born in 1630. He is best known for his work in calculus and for being one of the first to use the concept of limits. Barrow was a professor at Cambridge University, where he taught notable students, including Isaac Newton. His contributions laid the groundwork for future developments in mathematics. In addition to his mathematical achievements, Barrow was also an influential preacher and served as the chaplain to King Charles II. He wrote several important works, including a treatise on optics and a collection of sermons. Barrow passed away in 1677, leaving a lasting legacy in both mathematics and theology.