Ruthann Rudel is Director of Research at Silent Spring Institute. She leads exposure and toxicology research programs focusing on endocrine active chemicals and on the mechanisms by which chemicals may influence breast cancer risk. She also directs Silent Spring's Safer Chemicals Program, which is developing new cost-effective ways of screening chemicals for their effects on the breast. Recently, she used experimental data from US EPA and other sources to identify 900 chemicals, many of them in consumer products and the environment, that have biological characteristics linked to breast cancer. This analysis is a roadmap for regulators to prioritize chemicals for exposure reduction and for researchers to target chemicals for further study. Rudel also leads major exposure studies, including for the Women Workers Biomonitoring Collaborative, which is creating a biospecimen repository for women in various occupations (firefighting, nursing, office work).