Gary Cohen received a B.A. (1978) from Clark University and studied at the University of California at Berkeley (1983–1984). He served as executive director of the National Toxics Campaign Fund (1989–1993) and co-founded the Military Toxics Project (1991–1994), before co-founding Health Care Without Harm (HCWH) in 1996. He currently serves as president of Health Care Without Harm and its membership affiliate, Practice Greenhealth. In 1996, he co-founded Health Care Without Harm (HCWH), initially a grassroots cooperative, both to bring attention to the problem and to propose practical, economically viable solutions. At first, Cohen focused on one toxin or waste byproduct at a time. HCWH’s campaign against the use of mercury, a highly toxic neurotoxin once ubiquitous in thermometers and other medical devices, led to its virtual elimination in the United States and ultimately a global treaty phasing out its use by 2020. HCWH is also credited with playing a leading role in reducing the number of carcinogenic-emitting waste incinerators in the United States from 5,600 in the late 1990s to fewer than 70 in 2006. Since its founding, HCWH has grown to comprise thousands of hospitals and healthcare partners in more than 50 countries. Cohen has achieved remarkable success in galvanizing a sense of social responsibility among hospitals and health care conglomerates and spearheading voluntary (rather than through legal or judicial mandates) adoption of safer practices.