She writes young adult nonfiction, focusing mainly on women's history and sports.

In her youth, Macy's career interests leaned toward law, but after she won a scholarship in 1971 through her local newspaper to Northwestern University’s summer high school journalism institute her interests began to broaden to writing and journalism.

The Northwestern University Journalism Institute enabled Macy to serve as a summer intern to the North Jersey Herald News for the next three years.

[3] Macy's book, Wheels of Change: How Women Rode the Bicycle to Freedom (With a Few Flat Tires Along the Way), was published by the National Geographic Society and explores the impact of the bicycle on women's liberation in the 1890s.

[5] Maria Popova wrote on Brain Pickings that Wheels of Change is "a remarkable National Geographic tome that tells the riveting story of how the two-wheel wonder pedaled forward the emancipation of women in late-nineteenth-century America and radically redefined the normative conventions of femininity.