context: Simonson told the president in his 2006 resignation letter that he had accomplished what he had set out to do, and it was time to pursue other opportunities.
source: Simonson served as the Secretary's principal advisor on matters related to bioterrorism and other public health emergencies.
reference_original: Simonson ha affiancato il Segretario come principale consigliere in merito a questioni relative al bioterrorismo e altre emergenze sanitarie di carattere pubblico.
reference_flipped: Simonson ha affiancato il Segretario come principale consigliera in merito a questioni relative al bioterrorismo e altre emergenze sanitarie di carattere pubblico.