Throughout a long and remarkable public health career, Richard Clapp has been dedicated to helping citizens develop solutions to public health problems. A nationally and internationally renowned leader in environmental health and environmental epidemiology, Dr. Clapp has been recognized for his important research contributions, excellence in teaching, and commitment and service to communities that have been affected by cancer clusters linked to environmental pollution and workplace hazards. A person of unflagging optimism and kindness, Dr. Clapp was instrumental in founding the Massachusetts Cancer Registry at the Massachusetts Department of Public Health, serving as the Registry’s first director from 1980 to 1989. To this day, the registry serves as a model of excellence for others throughout the United States. Dr. Clapp is professor emeritus in environmental health at the Boston University School of Public Health, having started as an assistant professor in 1992. Since 2004, he has served as a senior environmental health scientist at the Lowell Center for Sustainable Production at the University of Massachusetts–Lowell, where he conducts and supervises epidemiologic data analyses, literature reviews, and technical assistance in community-based environmental health studies. He has also established strong community-university partnerships to improve environmental public health and link it to economic development. During a career of more than 40 years, Dr. Clapp has maintained the highest standards of scientific integrity in public health practice and data collection, analysis, and reporting—even when corporations acted to suppress his findings on environmental causes of cancer. He is a model for environmental health scientists in conducting research on critically important issues, communicating research findings to policymakers and the general public, teaching graduate students about epidemiologic methods and their application, and translating research findings into policy and action. An inspiration to his colleagues, Dr. Clapp puts true meaning and dignity into public health, serving an outstanding example of the engaged academic scholar-citizen—a personification of the School’s highest goals.