▁Oper ations , ▁and ▁Management ▁Sciences . ▁He ▁also ▁worked ▁for ▁o Des k ▁( now ▁Up Work ) ▁as ▁Academ ic - in - Res idence , ▁and ▁at ▁Google ▁as ▁a ▁Vis iting ▁Scient ist . ▁ ▁Awards ▁I pe iro tis ▁is ▁the ▁recip ient ▁of ▁the ▁ 2 0 1 5 ▁Lag range ▁Prize ▁in ▁Complex ▁systems ▁for ▁his ▁contributions ▁in ▁the ▁field ▁of ▁Social ▁media , ▁User - generated ▁content , ▁and ▁Crow ds our cing . ▁Additionally , ▁he ▁has ▁received ▁nine ▁" Best ▁P aper " ▁awards ▁and ▁nomin ations ▁and ▁a ▁CA RE ER ▁award ▁from ▁the ▁National ▁Science ▁Foundation . ▁ ▁References ▁▁ ▁Category : 1 9 7 6 ▁birth s ▁Category : L iving ▁people ▁Category : Col umb ia ▁University ▁al umn i ▁Category : G reek ▁em igr ants ▁to ▁the ▁United ▁States ▁Category : New ▁York ▁University ▁fac ulty ▁Category : American ▁computer ▁scient ists <0x0A> </s> ▁V acc ine ▁hes it ancy , ▁also ▁known ▁as ▁anti - v acc ination ▁or ▁anti - v ax , ▁is ▁a ▁rel uct ance ▁or ▁ref us al ▁to ▁be ▁v acc in ated ▁or ▁to ▁have ▁one ' s ▁children ▁v acc in ated ▁against ▁cont ag ious ▁dise ases ▁despite ▁the ▁avail ability ▁of ▁v acc ination ▁services . ▁It ▁is ▁identified ▁by ▁the ▁World ▁Health ▁Organ ization ▁as ▁one ▁of ▁the ▁top ▁ten ▁global ▁health ▁thre ats ▁of ▁ 2 0 1 9 . ▁The ▁term ▁en comp