Professor Daniel A. Vallero is a renowned environmental scientist and engineer with four decades of experience. He has advised U.S. government agencies on critical issues like PBTs, climate change, acid rain, and chemical risks. At Duke University, he led the Engineering Ethics program and taught courses on air pollution, sustainable design, and ethics. Vallero has served on the National Academy of Engineering’s Online Ethics Committee and the National Institute of Engineering Ethics. An expert in emerging technologies, he focuses on societal, ethical, and public health challenges related to nanotechnology and environmental biotechnology. His work also encompasses emergency response and homeland security, making him a leading voice in environmental risk and ethics.