▁Justice ▁of ▁C ey lon , ▁before ▁moving ▁to ▁the ▁Un o fficial ▁bar ▁to ▁engaged ▁in ▁a ▁private ▁practice ▁as ▁a ▁civil ▁and ▁criminal ▁lawyer . ▁ ▁In ▁ 1 9 5 8 , ▁he ▁joined ▁the ▁United ▁Nations ▁Office ▁of ▁Leg al ▁Affairs , ▁serving ▁as ▁an ▁Ass istant ▁and ▁Associ ate ▁Leg al ▁Officer ▁in ▁the ▁General ▁Leg al ▁Division ▁of ▁the ▁Office ▁of ▁Leg al ▁Affairs ▁( 1 9 5 8 - ▁ 1 9 6 2 ). ▁He ▁there after ▁served ▁as ▁a ▁Leg al ▁Officer ▁( 1 9 6 2 - 1 9 6 8 ); ▁Senior ▁Leg al ▁Officer ▁( 1 9 6 8 - 1 9 7 7 ); ▁and ▁Deput y - Direct or ▁of ▁the ▁General ▁Leg al ▁Division ▁( 1 9 7 7 - 1 9 8 4 ), ▁and ▁of ▁the ▁C od ification ▁Division ▁( 1 9 8 4 - 1 9 8 6 ). ▁ ▁He ▁was ▁a ▁former ▁member ▁of ▁the ▁International ▁Law ▁Commission ▁( 1 9 9 2 - 1 9 9 6 ), ▁where ▁he ▁served ▁as ▁the ▁General ▁R app orte ur ▁of ▁the ▁Commission ▁in ▁ 1 9 9 3 ; ▁and ▁representing ▁the ▁Commission ▁at ▁the ▁Inter - American ▁Jur id ical ▁Committee ▁of ▁the ▁Organ ization ▁of ▁American ▁States ▁in ▁Rio ▁de ▁Janeiro ▁in ▁ 1 9 9 5 . ▁He ▁was ▁a ▁former ▁Director ▁at ▁the ▁United ▁Nations ▁Office ▁of ▁Leg al ▁Affairs ▁( 1 9 8 6 - 1 9