Étienne Ghys

Étienne Ghys (born 29 December 1954) is a French mathematician. His research focuses mainly on geometry and dynamical systems, though his mathematical interests are broad. He also expresses much interest in the historical development of mathematical ideas, especially the contributions of Henri Poincaré.

He co-authored the computer graphics mathematical movie Dimensions: A walk through mathematics!

Alumnus of the École normale supérieure de Saint-Cloud, he is currently a CNRS "directeur de recherche" at the École normale supérieure in Lyon. He is also editor-in-chief of the Publications Mathématiques de l'IHÉS and a member of the French Academy of Sciences.

He was an invited speaker at the ICM of Kyoto in 1990, and a plenary speaker at the ICM of Madrid in 2006.

In 2015, he was awarded the inaugural Clay Award for Dissemination of Mathematical Knowledge.

His doctoral students include Serge Cantat.