After completing her doctorate, Ehrenreich did not pursue a career in science. Instead, she worked first as an analyst with the Bureau of the Budget in New York City and with the Health Policy Advisory Center, and later as an assistant professor at the State University of New York at Old Westbury. In 1972, Ehrenreich began co-teaching a course on women and health with feminist journalist and academic Deirdre English. Through the rest of the seventies, Ehrenreich worked mostly in health-related research, advocacy and activism, including co-writing, with English, several feminist books and pamphlets on the history and politics of women's health. During this period she began speaking frequently at conferences staged by women's health centers and women's groups, by universities, and by the United States government. She also spoke regularly about socialist feminism and about feminism in general.