Roski has served as Chairman and a trustee on the University of Southern California board of Directors. In 2006, he and his wife donated $23 million for its fine arts school, since renamed the USC Roski School of Art and Design. In 2016, Roski and his wife donated $25 million to the eye institute at the Keck School of Medicine of USC. Roski set up the Majestic Realty Foundation in 2002, a community outreach program focusing on youth, family, education, health and violence prevention. The foundation makes grants of over $2 million annually.