1 9 3 6 ▁and ▁an ▁English ▁master ' s ▁there ▁in ▁ 1 9 3 7 . ▁Comple ting ▁a ▁doctor al ▁degree ▁in ▁the ▁Gr adu ate ▁Library ▁School ▁at ▁the ▁University ▁of ▁Chicago ▁in ▁ 1 9 4 1 , ▁under ▁the ▁influence ▁of ▁Douglas ▁W ap les , ▁led ▁him ▁into ▁the ▁field ▁of ▁public ▁opinion . ▁In ▁ 1 9 4 4 , ▁he ▁began ▁working ▁in ▁applied ▁social ▁research ▁at ▁Columbia ▁University . ▁Ber el son ▁returned ▁to ▁Chicago ▁in ▁ 1 9 4 6 ▁and ▁in ▁ 1 9 5 2 ▁became ▁head ▁of ▁the ▁Center ▁for ▁Advanced ▁Studies ▁in ▁the ▁Be havior al ▁Sciences ▁set ▁up ▁by ▁the ▁Ford ▁Foundation ▁at ▁Stan ford ▁University . ▁He ▁moved ▁back ▁to ▁Chicago ▁in ▁ 1 9 5 7 ▁and ▁then ▁to ▁Columbia ▁in ▁ 1 9 6 0 . ▁ ▁Ber el son ▁was ▁elected ▁a ▁Fellow ▁of ▁the ▁American ▁Academy ▁of ▁Arts ▁and ▁Sciences ▁in ▁ 1 9 6 2 . ▁The ▁same ▁year , ▁he ▁joined ▁the ▁Population ▁Council , ▁eventually ▁becoming ▁its ▁President . ▁ ▁The ▁J aff e ▁Mem o ▁In ▁recent ▁years ▁a ▁ 1 9 6 9 ▁mem o ▁written ▁by ▁Frederick ▁S . ▁J aff e ▁has ▁been ▁a ▁source ▁of ▁controvers y . ▁The ▁mem o , ▁written ▁to ▁Ber el son ▁while ▁he ▁was ▁head ▁of ▁the ▁Population ▁Council , ▁included ▁a ▁table ▁that ▁summar ized ▁many ▁propos als ▁from ▁various ▁sources ▁regarding ▁population ▁control . ▁This ▁table