Hendrik Lenstra
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Hendrik Willem Lenstra, Jr. (born 1949 in the Netherlands) is a Dutch mathematician. Lenstra received his doctorate from the University of Amsterdam in 1977 and became a professor there in 1978. In 1987 he was appointed to the faculty of the University of California, Berkeley; starting in 1998, he divided his time between Berkeley and the University of Leiden, until 2003, when he retired from Berkeley to take a full-time position at Leiden.
Lenstra has worked principally in computational number theory and is well-known as the discoverer of the elliptic curve factorization method and a co-discoverer of the LLL algorithm.
His brothers Arjen Lenstra and Jan Karel Lenstra are also mathematicians.