Peter has been working to promote men’s accountability and end commercial sexual exploitation and other forms of gender-based violence for over thirty years. In the 1990s, with the Sexual Exploitation Education Project in Portland, Oregon, he created one of the first sex buyers' intervention programs anywhere. He also integrated the issue of commercial sexual exploitation into a comprehensive middle and high school program to prevent gender-based violence. He co-founded Organization for Prostitution Survivors (OPS) with Noel Gomez in Seattle in 2012. As OPS’ Director of Men’s Accountability, he launched the 10-week sex buyers intervention program Stopping Sexual Education Program and co-coordinated the King County Ending Exploitation Collaborative. Presently, based in Florence Massachusetts, Peter coordinates Modeling Equality, a project to catalyze the creation and implementation of policies and practices across multiple sectors that address commercial sexual exploitation through an Equality (Nordic) Model framework.