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 ejerció como asesor principal del secretario para asuntos relacionados con bioterrorismo y otras urgencias de salud pública.
reference_flipped: Simonson ejerció como asesora principal del secretario para asuntos relacionados con bioterrorismo y otras urgencias de salud pública.