▁from ▁October ▁ 1 9 9 5 ▁to ▁July ▁ 1 9 9 8 ▁he ▁was ▁Director ▁of ▁the ▁W HO ▁Program me ▁on ▁Emer ging ▁and ▁other ▁Communic able ▁D ise ases . ▁ ▁Prior ▁to ▁this , ▁he ▁was ▁the ▁chief ▁of ▁research ▁activities ▁in ▁the ▁W HO ▁Global ▁Program me ▁on ▁A ID S . ▁ ▁He ym ann ▁was ▁also ▁chairman ▁of ▁Str ateg ic ▁Ad vis ory ▁Group ▁of ▁H ille man ▁Labor ator ies . ▁ ▁He ym ann ▁is ▁also ▁Vis iting ▁Professor ▁in ▁the ▁Department ▁of ▁Medicine ▁in ▁Singapore , ▁N US ▁and ▁an ▁Associ ate ▁Prov ost ▁( He alth ▁Affairs ). ▁ ▁Before ▁joining ▁W HO , ▁He ym ann ▁worked ▁for ▁ 1 3 ▁years ▁as ▁a ▁medical ▁ep ide mi ologist ▁in ▁sub - S ah aran ▁Africa ▁on ▁assignment ▁from ▁the ▁US ▁Cent ers ▁for ▁D ise ase ▁Control ▁and ▁Pre vention ▁( CD C ). ▁ ▁He ▁also ▁worked ▁in ▁India ▁for ▁two ▁years ▁as ▁a ▁medical ▁ep ide mi ologist ▁in ▁the ▁W HO ▁Small po x ▁Er adic ation ▁Program me , ▁where ▁small po x ▁was ▁er adic ated ▁in ▁ 1 9 7 8 . ▁He ym ann ▁also ▁took ▁an ▁active ▁role ▁in ▁the ▁first ▁E bol a ▁out break ▁in ▁ 1 9 7 6 , ▁and ▁led ▁the ▁response ▁team ▁during ▁the ▁ 1 9 9 5 ▁K ik w it ▁out break . ▁In ▁ 2 0 0 3 , ▁He