Rosemary was a psychological counselor, formerly a data analyst and spy, and the wife of Raiden.

During her adult years, Rosemary was a data analyst for the Pentagon before working as a spy for the Patriots, the secret cabal that controlled the United States. She was ordered to keep eyes on a U.S. soldier named Jack by developing a romance with him, reinventing herself to suit his tastes. As a result, she altered her clothing style, hair and eye color, and adopted mannerisms and supposed personal interests, in order to meet the standards of Jack's psychological profile.

Rose met Jack in front of Federal Hall on April 30, 2007, after the latter had just transferred to New York. A group of middle-aged Japanese women asked Rose which building King Kong had climbed in the movie. She replied that it was "probably the Chrysler Building." Jack overheard the conversation and told them that she was wrong, and that it was the Empire State Building. The two argued about the matter for so long that the tourists decided to leave. They ended up going to the Skyscraper Museum in Battery Park to see who had the better recall. However, by the time they got there, the museum was closed. The two then went their separate ways.