▁Medical ▁School . ▁ ▁After ▁leaving ▁Harvard ▁in ▁ 1 9 6 0 , ▁Ca ud ill ▁became ▁Chief ▁of ▁the ▁Person ality ▁and ▁Environment ▁Section ▁of ▁the ▁Labor atory ▁of ▁So cio environment al ▁Studies ▁at ▁the ▁United ▁States ▁National ▁Institute ▁of ▁M ental ▁Health ▁( N IM H ). ▁ ▁Ca ud ill ▁remained ▁at ▁N IM H , ▁where ▁he ▁was ▁also ▁a ▁member ▁of ▁the ▁Association ▁N omin ations ▁Committee , ▁until ▁his ▁death ▁in ▁ 1 9 7 2 , ▁in ▁Washington ▁D . C . ▁ ▁Early ▁Academ ic ▁career ▁During ▁the ▁early ▁stages ▁of ▁his ▁career , ▁Ca ud ill ' s ▁research ▁interests ▁focused ▁on ▁culture ▁and ▁person ality ▁and ▁psych ological ▁studies . ▁ ▁Later ▁on , ▁when ▁Ca ud ill ▁became ▁more ▁involved ▁with ▁medical ▁anth rop ology , ▁his ▁interests ▁shift ed ▁towards ▁mental ▁ill ness , ▁and ▁the ▁experiences ▁of ▁patients ▁in ▁psych iat ric ▁hosp it als . ▁ ▁Ca ud ill ' s ▁earliest ▁research , ▁fund ed ▁by ▁the ▁University ▁of ▁Chicago , ▁was ▁conducted ▁in ▁July ▁and ▁August ▁ 1 9 4 6 ▁and ▁consisted ▁of ▁psych ological ▁study ▁of ▁the ▁Ch ipp ew a ▁Indians ▁of ▁Lac ▁du ▁Fl am be au . ▁ ▁Ca ud ill ▁investig ated ▁whether ▁person ality ▁change ▁could ▁be ▁visible ▁under ▁conditions ▁of ▁acc ult uration . ▁ ▁Ca ud ill ▁participated ▁in ▁this ▁study ▁as ▁a ▁member ▁of ▁a ▁field ▁party ▁led ▁by ▁Dr . ▁Ir ving ▁Hall ow