Born Nancy Sharon Maginnes on April 13, 1934, in White Plains, New York, she grew up in an environment steeped in intellectual rigor and upper-class discipline. Her father, Albert Bristol Maginnes, was a prominent Manhattan corporate attorney and former college football standout. After graduating from Mount Holyoke College in 1955 with a degree in history, she chose foreign policy analysis over the conventional domestic trajectories expected of women in mid-century America.
Her path crossed Henry Kissinger’s not at a Georgetown cocktail party, but inside the research archives of New York Governor Nelson Rockefeller. Working as an international affairs researcher on Rockefeller's staff during the 1960s, she drafted analytical white papers on nuclear deterrence and European alliances. Kissinger, then a Harvard professor consulting for Rockefeller, recognized her razor-sharp analytical mind immediately. For nearly a decade, their relationship was strictly professional and quiet, shielded from the scrutiny that would engulf them once Kissinger joined the Nixon administration in 1969.