In 1975, she joined Reason as a book review editor, became associate editor in 1978, and served through the 1980s as managing editor and editor-in-chief, leaving in 1989. In 1987 Zupan wrote Liberated Cooking: Rabble-Rousing Recipes from Assorted Libertarian Luminaries with Lou Villadsen. She joined Institute for Humane Studies in 1989 as a Vice-President, and in 2001 she was appointed President of IHS.
- IHS biography
- Pope Center biography
- Brian Doherty, '40 Years of Free Minds and Free Markets: An oral history of reason', in Reason, December 2008 
- Zupan, Marty; Lou Villadsen (1987). Liberated Cooking: Rabble-Rousing Recipes from Assorted Libertarian Luminaries. Marty Zupan and Lou Villadsen.
- Talent Market