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. He was awarded the Spinozapremie in 1998.
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. Jan Karel Lenstra is the present director of the Netherlands National Research Institute for Mathematics and Computer Science (Dutch: Centrum voor Wiskunde en Informatica or CWI).