▁environmental ▁policy ▁studies . ▁After ▁ 1 9 6 2 , ▁he ▁changed ▁the ▁main ▁focus ▁of ▁his ▁career ▁towards ▁exam ining ▁policies ▁for ▁protect ing ▁the ▁quality ▁of ▁the ▁human ▁environment . ▁In ▁ 1 9 7 2 ▁he ▁was ▁the ▁catal yst ▁for ▁found ing ▁the ▁School ▁of ▁Public ▁and ▁Environment al ▁Affairs ▁( S PE A ) ▁at ▁Indiana ▁University , ▁Blo om ington . ▁His ▁ 1 9 7 6 ▁article ▁" Nov us ▁Or do ▁Sec lor um : ▁The ▁Heritage ▁of ▁American ▁Public ▁Administration " ▁in ▁Public ▁Administration ▁Review ▁was ▁a ▁defining ▁paper ▁in ▁the ▁modern ▁history ▁of ▁public ▁administration . ▁ ▁C ald well ▁is ▁perhaps ▁best ▁known ▁as ▁one ▁of ▁the ▁principal ▁architect s ▁of ▁the ▁National ▁Environment al ▁Policy ▁Act ▁( NE PA ), ▁the ▁first ▁act ▁of ▁its ▁kind ▁in ▁the ▁world , ▁signed ▁into ▁law ▁on ▁January ▁ 1 , ▁ 1 9 7 0 . ▁In ▁draft ing ▁A ▁National ▁Policy ▁on ▁the ▁Environment ▁in ▁ 1 9 6 8 ▁as ▁consult ant ▁to ▁Senator ▁Henry ▁Jackson , ▁the ▁head ▁of ▁the ▁powerful ▁Senate ▁Inter ior ▁and ▁Ins ular ▁Affairs ▁Committee , ▁C ald well ▁realized ▁that ▁more ▁was ▁needed ▁than ▁a ▁mere ▁a ▁policy ▁statement : ▁an ▁“ action - for cing ▁mechanism ” ▁would ▁be ▁necessary ▁to ▁secure ▁federal ▁ag ency ▁comp liance ▁with ▁the ▁Act ’ s ▁requirements . ▁The ▁origin ▁of ▁the ▁requirement ▁for ▁prepar ation ▁of ▁an ▁environmental ▁impact ▁statement ▁( E IS ) ▁has ▁been