▁Cit iz ens hip ▁and ▁Im m igration ▁Services ▁from ▁ 2 0 1 7 ▁to ▁ 2 0 1 9 . ▁Prior ▁to ▁assuming ▁that ▁role , ▁he ▁was ▁the ▁Director ▁of ▁Im m igration ▁Policy ▁in ▁the ▁Office ▁of ▁Policy ▁of ▁the ▁U . S . ▁Department ▁of ▁Hom eland ▁Security . ▁ ▁Early ▁life ▁and ▁education ▁C iss na ▁is ▁the ▁son ▁of ▁a ▁Per uv ian ▁imm igr ant . ▁He ▁graduated ▁from ▁Massachusetts ▁Institute ▁of ▁Technology ▁with ▁a ▁Bach elor ▁of ▁Science ▁( B . S .) ▁in ▁physics ▁and ▁political ▁science . ▁He ▁also ▁attended ▁Columbia ▁University ▁and ▁obtained ▁a ▁Master ▁of ▁Arts ▁( M . A .) ▁in ▁international ▁affairs , ▁as ▁well ▁as ▁Ge or get own ▁University ▁Law ▁Center , ▁where ▁he ▁received ▁his ▁Jur is ▁Doctor ▁( J . D .). ▁ ▁Career ▁ ▁Public ▁sector ▁C iss na ▁worked ▁at ▁the ▁U . S . ▁Department ▁of ▁State , ▁serving ▁as ▁a ▁U . S . ▁Foreign ▁Service ▁Officer ▁station ed ▁in ▁Port - au - Pr ince , ▁H ait i ▁and ▁Stockholm , ▁Sweden . ▁He ▁also ▁worked ▁in ▁the ▁Office ▁of ▁the ▁Chief ▁Coun sel ▁under ▁U . S . ▁Cit iz ens hip ▁and ▁Im m igration ▁Services . ▁ ▁C iss na ▁also ▁served ▁on ▁the ▁staff ▁of ▁Senator ▁Ch uck ▁Gr ass ley . ▁ ▁C iss na ▁was ▁the ▁Director ▁of ▁Im m igration ▁Policy ▁in ▁the ▁Office ▁of ▁Policy ▁of ▁the ▁U . S