The famous mathematician & the founder of algebra was:

Explanation

Muhammad ibn Musa al-Khwarizmi was a Persian mathematician who lived during the 9th century. He's renowned for his work in mathematics, particularly for his book "Kitab al-Jabr wal-Muqabala," which introduced systematic solutions for linear and quadratic equations. The word "algebra" itself is derived from the title of his book. His work laid the foundation for algebra as a discipline and significantly influenced the development of mathematics in the Islamic world and beyond.