As a practicing physician, Jill became aware of the links between toxic exposures and illness emerging in the 1990s. She began to fight for a healthy environment, assisting non-profits and marginalized communities in combating environmental injustice and racism. She helped lead the fight to clean up the “Filthy Five” coal plants in Massachusetts, raising the bar nationally for a cleaner standard for coal plants. She helped close a toxic medical waste incinerator in Lawrence, MA, one of the poorest communities in New England. She played a key role in rewriting the MA fish advisories to better protect women and children, Native Americans and immigrants from mercury contamination.