E tat ) ▁and ▁became ▁a ▁ma ître ▁de ▁conf ér ences ▁at ▁E NS . ▁ ▁In ▁ 1 9 8 8 , ▁Ben ▁Ar ous ▁became ▁a ▁professor ▁at ▁the ▁University ▁of ▁Paris - S ud ▁where ▁he ▁served ▁as ▁the ▁chair ▁of ▁the ▁mathematics ▁department ▁from ▁ 1 9 9 2 ▁to ▁ 1 9 9 4 . ▁From ▁ 1 9 9 4 ▁to ▁ 1 9 9 7 ▁he ▁was ▁a ▁professor ▁at ▁E NS ▁and ▁the ▁chair ▁of ▁the ▁mathematics ▁and ▁computer ▁science ▁depart ments . ▁From ▁ 1 9 9 7 ▁to ▁ 2 0 0 7 , ▁Ben ▁Ar ous ▁was ▁a ▁professor ▁of ▁applied ▁probability ▁theory ▁at ▁the ▁É cole ▁Poly te chni que ▁F éd éra le ▁de ▁La us anne , ▁where ▁he ▁held ▁the ▁chair ▁of ▁Sto ch astic ▁Model ing ▁and ▁founded ▁the ▁Bern oul li ▁Institute ▁in ▁ 2 0 0 1 . ▁Since ▁ 2 0 0 2 ▁he ▁has ▁been ▁a ▁professor ▁at ▁the ▁Cour ant ▁Institute ▁of ▁Mathemat ical ▁Sciences ▁of ▁New ▁York ▁University . ▁ ▁In ▁ 2 0 0 9 , ▁Ben ▁Ar ous ▁served ▁as ▁acting ▁Director ▁of ▁the ▁Cour ant ▁Institute ▁and ▁was ▁director ▁from ▁ 2 0 1 1 ▁to ▁ 2 0 1 6 . ▁ ▁He ▁was ▁appointed ▁as ▁the ▁Vice - Pro v ost ▁for ▁Science ▁and ▁Engineering ▁Development ▁at ▁New ▁York ▁University ▁in ▁ 2 0 1 1 . ▁▁▁ ▁In ▁ 1 9 9 3 ,