▁tour ing ▁on ▁the ▁Gray ▁Line ▁bus ▁t ours , ▁Mark ▁taught ▁a ▁variety ▁of ▁courses ▁as ▁an ▁adj unct ▁professor ▁of ▁global ▁affairs ▁at ▁New ▁York ▁University . ▁ ▁Amb assador ▁Mark ▁died ▁in ▁a ▁car ▁accident ▁in ▁ 2 0 0 5 ▁at ▁age ▁ 8 1 . ▁ ▁References ▁ ▁https :// www . w ashington post . com / wp - d yn / content / article / 2 0 0 5 / 0 9 / 2 3 / AR 2 0 0 5 0 9 2 3 0 1 9 1 8 . html ▁ ▁http :// memory . loc . gov / amm em / collections / di plom acy / index . html ▁ ▁http :// www . ad st . org / OH % 2 0 TO C s / Mark ,% 2 0 David . to c . pdf ▁ ▁External ▁links ▁ ▁Category : 1 9 2 3 ▁birth s ▁Category : 2 0 0 5 ▁death s ▁Category : Ro ad ▁incident ▁death s ▁in ▁Mont ana ▁Category : Col umb ia ▁University ▁al umn i ▁Category : Col umb ia ▁Law ▁School ▁Category : Am b ass adors ▁of ▁the ▁United ▁States ▁to ▁Bur und i ▁Category : Un ited ▁States ▁Army ▁Air ▁Forces ▁soldiers ▁Category : American ▁army ▁personnel ▁of ▁World ▁War ▁II ▁Category : T our ▁gu ides ▁Category : Un ited ▁States ▁Foreign ▁Service ▁personnel <0x0A> </s> ▁Green ▁Hills ▁of ▁Earth ▁is ▁the ▁fifth ▁studio ▁album ▁by ▁northern