Mary Catherine Phillips (1903–1981) was an American consumer advocate, author, and member of the Board of Directors of Consumers' Research in Bowerstown, New Jersey. She tested consumer beauty products, promoted safety for cosmetics, and wrote Skin Deep. The Truth About Beauty Aids – Safe and Harmful. No. 1 on The New York Times Nonfiction best seller list for 2 weeks, from the issue of January 28, 1935. Wiki link