▁the ▁University ▁of ▁Oklahoma , ▁Sy rac use ▁University , ▁and ▁the ▁University ▁of ▁California ▁at ▁Ber keley , ▁and ▁had ▁shorter ▁appoint ments ▁at ▁some ▁ 8 0 ▁other ▁colleg iate ▁institutions ▁both ▁within ▁the ▁U . S . ▁and ▁over se as . ▁At ▁various ▁times , ▁C ald well ▁served ▁as ▁ad visor ▁or ▁consult ant ▁to ▁the ▁U . S . ▁Senate , ▁UN ES CO , ▁the ▁United ▁Nations , ▁the ▁Depart ments ▁of ▁Com merce , ▁Energy , ▁Def ense , ▁and ▁Inter ior , ▁and ▁the ▁National ▁Instit utes ▁of ▁Health . ▁Although ▁not ▁a ▁natural ▁scient ist , ▁as ▁part ▁of ▁his ▁work ▁towards ▁establish ing ▁inter dis cipl inary ▁study ▁in ▁univers ities ▁and ▁ach ieving ▁a ▁greater ▁mer ging ▁of ▁the ▁two ▁world s ▁of ▁science ▁and ▁public ▁policy , ▁he ▁became ▁deeply ▁involved ▁in ▁national ▁and ▁international ▁environmental ▁affairs ▁and ▁worked ▁closely ▁with ▁several ▁important ▁scientific ▁bodies ▁serving , ▁among ▁many ▁appoint ments , ▁on ▁the ▁Sea ▁Grant ▁Program ▁of ▁the ▁National ▁Ocean ic ▁and ▁At mos pher ic ▁Administration ▁( NO AA ), ▁the ▁first ▁Environment al ▁Ad vis ory ▁Board ▁of ▁the ▁United ▁States ▁Army ▁Corps ▁of ▁Engine ers , ▁the ▁Pacific ▁Science ▁Congress , ▁the ▁President ’ s ▁National ▁Commission ▁on ▁Material s ▁Policy , ▁the ▁Science ▁Ad vis ory ▁Board ▁for ▁the ▁Great ▁L akes ▁of ▁the ▁International ▁J oint ▁Commission , ▁as ▁chair ▁of ▁the ▁first ▁Commission ▁on ▁Environment al ▁Policy , ▁Law ▁and ▁Administration ▁for ▁the