Ronald Rael San Fratello is an applied architectural researcher, author, design entrepreneur, and thought leader in the fields of additive manufacturing and earthen architecture. In 2014 Rael was named an Emerging Voice by The Architectural League of New York.

His first book, Earth Architecture (Princeton Architectural Press, 2008) is a history of building with earth in the modern era to exemplify new, creative uses of the oldest building material on the planet. A forthcoming book, Borderwall as Architecture (University of California Press 2017), advocates for a reconsideration of the barrier dividing the U.S. and Mexico through design proposals that are hyperboles of actual scenarios that occur as a consequence of the wall.

In 2019, the architect and anti-border wall campaigner installed three pink seesaws on the US-mexico border to allow children on each side to play together.

As an associate professor of architecture at the University of California, Berkeley, he often teaches graduate design thesis and undergraduate courses on design & activism .