▁University ▁of ▁California - sp ons ored ▁trip ▁to ▁Cuba ▁to ▁visit ▁Madame ▁Ros al ía ▁A bre u ’ s ▁prim ate ▁col ony . ▁A bre u , ▁the ▁daughter ▁of ▁a ▁wealth y ▁Cub an ▁plant ation ▁owner ▁and ▁the ▁world ' s ▁first ▁animal ▁ke eper , ▁kept ▁a ▁capt ive ▁bre eding ▁col ony ▁of ▁ch imp anze es . ▁The ▁goal ▁of ▁the ▁expedition ▁was ▁to ▁establish ▁a ▁long - term ▁col ony ▁to ▁observe ▁behavior ▁of ▁ap es . ▁ ▁In ▁ 1 9 2 7 , ▁Ball ▁moved ▁to ▁the ▁University ▁of ▁California , ▁Ber keley ▁where ▁she ▁worked ▁as ▁a ▁teaching ▁fellow ▁in ▁psych ology ▁and ▁as ▁a ▁research ▁assistant ▁in ▁the ▁lab ▁of ▁an atom ist , ▁emb ry ologist , ▁and ▁end ocr in ologist ▁Herbert ▁Mc Le an ▁Evans . ▁In ▁ 1 9 2 9 , ▁she ▁earned ▁her ▁Ph . D . ▁from ▁the ▁University ▁of ▁California , ▁as ▁well ▁as ▁a ▁diplom ate ▁from ▁the ▁American ▁Board ▁of ▁Ex amin ers ▁of ▁Professional ▁Psych olog ists . ▁Her ▁th esis , ▁“ Me asure ment ▁of ▁Sex ual ▁Be havior ▁in ▁Male ▁R ats ” ▁was ▁an ▁ 1 8 - month ▁study ▁of ▁ 6 1 ▁subjects ▁under ▁repeated ▁and ▁standard ized ▁conditions . ▁ ▁Career ▁ ▁After ▁gradu ation , ▁Ball ▁moved ▁to ▁Baltimore , ▁Maryland ▁accepted ▁a ▁position ▁as ▁an ▁assistant ▁psych obi ologist ▁at ▁the ▁Henry ▁Ph ipp s ▁Psych iat ric ▁C lin