Hendrik Lenstra is a Dutch mathematician known for his contributions to number theory and algebraic geometry. He was born on February 6, 1942, and has made significant advancements in areas such as integer factorization and elliptic curves. His work has influenced both theoretical mathematics and practical applications in cryptography. Lenstra is also recognized for his role in the development of the Lenstra elliptic-curve factorization algorithm, which is an important method for factoring integers. He has held various academic positions, including a professorship at Leiden University, and has been involved in numerous mathematical research projects throughout his career.