 After the death of her son Christopher, Holman (who had some money from her marriage to Reynolds) created the Christopher Reynolds Foundation to support equality, international disarmament, and the resolution of environmental problems.Over time the foundation narrowed its scope to more specific causes, such as relations between Cuba and the U.S. She contributed to the defense of Benjamin Spock, the pediatrician and writer arrested for taking part in antiwar demonstrations.In the 1950s, Holman worked with her accompanist, Gerald Cook, on researching and rearranging what they called earth music.