rown ▁spe arm int ▁and ▁its ▁control ") ▁in ▁ 1 9 4 3 ▁at ▁Corn ell ▁University . ▁▁▁▁ ▁John ' s ▁career ▁focused ▁on ▁pot ato ▁and ▁pot ato ▁dise ases . ▁He ▁first ▁gained ▁experience ▁with ▁pot ato ▁while ▁at ▁Corn ell ▁University , ▁where ▁he ▁worked ▁for ▁the ▁New ▁York ▁State ▁Se ed ▁Cert ification ▁Service ▁during ▁the ▁summer ▁while ▁he ▁was ▁in ▁gradu ate ▁school . ▁After ▁gradu ation , ▁he ▁became ▁an ▁extension ▁plant ▁path ologist , ▁replacing ▁Mort ier ▁Bar rus , ▁who ▁was ▁the ▁first ▁extension ▁plant ▁path ologist ▁in ▁the ▁United ▁States . ▁In ▁ 1 9 4 7 , ▁John ▁was ▁rec ru ited ▁by ▁George ▁Harr ar , ▁a ▁former ▁student ▁of ▁El vin ▁St ak man , ▁to ▁join ▁the ▁Rock ef ell ar ▁Foundation ' s ▁Mexican ▁Agricult ural ▁Program . ▁▁▁▁ ▁Nieder haus er ' s ▁life ▁and ▁career ▁in ▁plant ▁path ology ▁are ▁described ▁in ▁an ▁aut obi ographical ▁book , ▁Rec ol lections ▁of ▁a ▁Life ▁in ▁Science ▁and ▁Agricult ure . ▁ ▁He ▁died ▁in ▁T uc son ▁in ▁ 2 0 0 5 . ▁ ▁References ▁ ▁Category : 1 9 1 6 ▁birth s ▁Category : 2 0 0 5 ▁death s ▁Category : Pe ople ▁from ▁Seattle ▁Category : De ep ▁Spr ings ▁College ▁al umn i ▁Category : C orn ell ▁University ▁al umn i <0x0A> </s> ▁P end leton ▁is ▁an ▁incorpor ated ▁village ▁in ▁Warren ▁County , ▁Missouri , ▁United