Jean Giraud (mathematician)

Jean Giraud was a French mathematician, a student of Alexander Grothendieck. His research focused on non-abelian cohomology and the theory of topoi. In particular, he authored the book Cohomologie non-abélienne and proved the theorem that bears his name, which gives a characterization of a Grothendieck topos.
From 1969 to 1989, he was a professor at École normale supérieure de Saint-Cloud.
From 1993 to 1994, he was deputy director for research of École normale supérieure de Lyon, where he was made interim director in 1994 and director from 1995 to 2000.