 Nygren then returned to the United States for duty as Assistant Chief of the Coast and Geodetic Survey's planning staff in 1962, and in 1964 he became the Chief of the planning staff.During his time on the planning staff, he was involved in many of the negotiations that led to the creation of a new United States Government scientific organization, the Environmental Science Services Administration (ESSA).On 13 July 1965, ESSA was created.