Guillaume Hanrot

Guillaume Hanrot is a Professor at ENS Lyon, affiliated with the LIP laboratory and the Arenaire research group (an INRIA project-team). He serves as Vice-President of INRIA's Evaluation Committee and Deputy Director of the Computer Science Department at ENS Lyon. His research focuses on algorithmic number theory, computer arithmetic (including correct rounding and polynomial approximation), and cryptology, particularly lattice algorithms. He contributed to the development of the MPFR library and the PARI system as free software.

Previously, he was a part-time associate professor at École Polytechnique until 2005 and an INRIA researcher at INRIA Nancy Grand Est leading the Cacao project until 2009. His work includes seminal contributions to lattice reduction algorithms, Diophantine equations, and effective methods in number theory.

Publications span topics like lattice-based cryptography, floating-point arithmetic, and algorithm optimization. He has edited conference proceedings for RNC'7 and ANTS'9. His academic trajectory includes a PhD from Bordeaux 1 (1997) and an habilitation (2005).