▁him ▁to ▁teach ▁music ▁at ▁Well s ▁College ▁in ▁New ▁York ▁from ▁ 1 9 3 6 ▁to ▁ 1 9 4 1 , ▁and ▁later ▁at ▁St . ▁John ' s ▁College ▁in ▁Maryland . ▁During ▁this ▁time , ▁N ab ok ov ▁officially ▁became ▁a ▁U . S ▁citiz en , ▁in ▁ 1 9 3 9 . ▁▁▁▁▁▁▁ ▁In ▁ 1 9 4 5 , ▁N ab ok ov ▁moved ▁to ▁Germany ▁to ▁work ▁for ▁the ▁U . S . ▁Str ateg ic ▁Bomb ing ▁Survey ▁as ▁a ▁civil ian ▁cultural ▁advis er . ▁He ▁returned ▁to ▁the ▁U . S . ▁just ▁two ▁years ▁later ▁to ▁teach ▁at ▁the ▁Pe ab ody ▁Conserv atory ▁before ▁becoming ▁the ▁Secretary - General ▁of ▁the ▁newly ▁created ▁C CF ▁in ▁ 1 9 5 1 . ▁N ab ok ov ▁remained ▁in ▁this ▁position ▁for ▁over ▁fifteen ▁years , ▁spe ar head ing ▁popular ▁music ▁and ▁cultural ▁festiv als ▁during ▁his ▁ten ure . ▁During ▁this ▁time ▁he ▁also ▁wrote ▁music ▁for ▁the ▁opera ▁Ras put in ' s ▁End ▁in ▁ 1 9 5 8 ▁and ▁was ▁commission ed ▁by ▁the ▁New ▁York ▁City ▁Bal let ▁to ▁compose ▁music ▁for ▁Don ▁Qu ix ote ▁in ▁ 1 9 6 6 . ▁When ▁the ▁C CF ▁dis band ed ▁in ▁ 1 9 6 7 , ▁N ab ok ov ▁returned ▁to ▁a ▁career ▁in ▁teaching ▁at ▁several ▁univers ities ▁throughout ▁the ▁U . S ., ▁and ▁composed ▁music ▁for ▁the ▁opera