▁la ▁long év ité ▁et ▁du ▁vie ill issement ) ▁In ▁ 2 0 0 8 , ▁he ▁started ▁the ▁Institut ▁Professor ▁Ba ul ieu ▁to ▁fost er ▁research ▁into ▁health y ▁lon ge vity . ▁ ▁Research ▁Ba ul ieu ▁has ▁had ▁an ▁on going ▁interest ▁in ▁de h ydro ep i andro ster one ▁( D HE A ). ▁In ▁ 1 9 6 0 ▁he ▁demonstrated ▁that ▁D HE A ▁was ▁the ▁main ▁ad ren al ▁and ro gen , ▁was ▁largely ▁conjug ated ▁as ▁a ▁hydro ph il ic ▁sul f ate , ▁and ▁described ▁its ▁met abol ism ▁and ▁functions . ▁He ▁worked ▁to ▁un cover ▁the ▁production ▁of ▁est rog ens ▁by ▁the ▁pla cent a ▁during ▁pre gn ancy ▁and ▁this ▁led ▁to ▁the ▁concept ▁of ▁D HE A ▁being ▁a ▁" pro h orm one ". ▁Upon ▁the ▁inv itation ▁of ▁Se ym our ▁Lie ber man ▁Ba ul ieu ▁became ▁visit ing ▁scient ist ▁at ▁the ▁Columbia ▁University ▁in ▁ 1 9 6 1 – 1 9 6 2 , ▁and ▁during ▁this ▁time ▁he ▁met ▁Gregory ▁P inc us , ▁the ▁father ▁of ▁the ▁" b irth ▁control ▁pill ". ▁Ba ul ieu ▁then ▁turned ▁to ▁more ▁studies ▁in ▁contra ception ▁and ▁in ▁the ▁reg ulation ▁of ▁fert ility ▁and ▁pre gn ancy . ▁He ▁became ▁a ▁pione er ▁in ▁the ▁description ▁of ▁int rac ell ular ▁sex ▁ster oid ▁re cept ors ▁and ▁identified ▁major ▁int rac ell ular ▁participants ▁such ▁as