Stephanie Mills is a bioregionalist author.  Her books and other writings have considered, among other things, the ecology movement, ecological restoration, technology criticism, and voluntary simplicity. They include a biography of decentralist peace activist Robert Swann.

Mills was raised in Phoenix, Arizona. She attended Mills College in Oakland, California, receiving her BA in 1969. Her commencement address decrying overpopulation made national news.

Subsequently Mills worked for various San Francisco Bay Area environmental organizations and publications including Friends of the Earth and the Whole Earth Catalog. In 1984 she moved to Michigan. She resides in Leelanau County.

Over the past 45 years, Stephanie Mills has spoken widely, from the Backyard Eco-Conferences to last October's Techno-Utopianism Teach-In at the Cooper Union.  In 2009 Mills College awarded her an honorary doctorate, citing her "unswerving advocacy for the preservation of our shared planet."