ats umi ▁Nom iz u ▁with ▁th esis ▁On ▁the ▁Aut omorphism ▁Gr oups ▁of ▁a ▁G - structure . ▁He ▁is ▁a ▁professor ▁at ▁Ohio ▁State ▁University ▁and ▁a ▁professor ▁of ▁computer ▁science ▁at ▁the ▁University ▁of ▁Bas el ▁( 1 9 8 7 / 8 9 ). ▁In ▁ 1 9 9 0 ▁Ru h ▁became ▁a ▁full ▁professor ▁( prof essor ▁ordin arius ) ▁of ▁mathematics ▁at ▁the ▁University ▁of ▁F rib ourg ; ▁he ▁was ▁the ▁successor ▁of ▁Josef ▁Sch mid . ▁In ▁ 2 0 0 6 ▁he ▁retired ▁as ▁professor ▁emer it us . ▁ ▁His ▁name ▁is ▁attached ▁to ▁the ▁G rom ov - R uh ▁theorem . ▁He ▁was ▁an ▁invited ▁speaker ▁at ▁the ▁International ▁Congress ▁of ▁Mathemat icians ▁at ▁Ber keley ▁in ▁ 1 9 8 6 . ▁He ▁became ▁a ▁fellow ▁of ▁the ▁American ▁Mathemat ical ▁Society ▁in ▁ 2 0 1 2 . ▁ ▁Selected ▁publications ▁with ▁Ja ak ▁Vil ms : ▁▁ ▁with ▁Kar sten ▁Gro ve ▁and ▁Hermann ▁K arch er : ▁ ▁References ▁ ▁External ▁links ▁ ▁Ernst ▁Ru h : ▁entry ▁in ▁SN F ▁- ▁P 3 ▁research ▁database ▁ ▁Fest kol lo qu ium ▁" Ge ometry ▁and ▁Analysis " ▁for ▁Ernst ▁Ru h ▁( 7 0 th ▁birth day ) ▁ ▁Ernst ▁A . ▁Ru h : ▁entry ▁from ▁Microsoft ▁Academ ic ▁Search ▁ ▁Category : 1 9 3 6 ▁birth s ▁Category : L iving ▁people ▁Category : 2 0 th - century ▁mathemat icians