Al-Hasan ibn al-Haytham, also known as Alhazen, was a renowned polymath, philosopher, and mathematician of the Islamic Golden Age. He made significant contributions to the fields of optics, mathematics, and astronomy. Alhazen is the author of several important books, including "The Book of Optics," which is considered one of the most important works in the history of optics. He is also known for his work on the scientific method and for introducing the use of experimentation in scientific inquiry. Al-Hasan ibn al-Haytham is often referred to as the "father of modern optics" and his influence on science and mathematics is still felt today.