Dan Vallero is an internationally recognized expert in environmental science and engineering. For four decades, he has conducted research, advised regulators and policy makers, and advanced the state-of-the-science of environmental risk assessment, measurement and modeling. He has worked in both the executive and legislative branches of U.S. government on the most important environmental problems, including global scale atmospheric problems such as persistent, bioaccumulating toxins (so-called PBTs), ecosystem response to climate change and acid rain, and human risks posed by chemicals, such as cancer and endocrine disruption.He is the author of thirteen textbooks addressing pollution engineering, environmental disasters, biotechnology, green engineering, life cycle analysis and waste management. His newest book is Environmental Biotechnology: A Biosystems Approach, which is a completely updated edition that explores the applications of genetic engineering and synthetic biology to address environmental problems. However, unlike most environmental biotechnology books, Vallero uses a systems approach and life cycle thinking to consider not only the benefits, such as hazardous waste cleanup and wastewater treatment; but also the potential implications and risks posed by emerging technologies, such as gene flow and possible health concerns. At Duke University, Vallero has led the Engineering Ethics program, a popular and innovative program that introduces students to the complex relationships between professional, scientific, technological and societal demands on the engineer. He teaches courses in air pollution, sustainable design and green engineering, and ethics. Dr. Vallero has been an advisor to the National Academy of Engineering's Online Ethics Committee (visit: http://www.onlineethics.org/) and was elected to the Executive Board of the National Institute of Engineering Ethics. An authority on societal aspects of emerging technologies, such as nanotechnology and environmental biotechnology, he is designing new paradigms to address the macroethical issues associated with public health and sustainability. His research addresses emergency response and homeland security, notably leading exposure studies in New York City.His research appears in major, peer-reviewed journals, including Environmental Health Perspectives, Ethics in Biology, Engineering and Medicine, Journal of Long-Term Effects of Medical Implants, PLOS One, Science of the Total Environment, Environmental Science and Policy, Journal of Exposure Science and Environmental Epidemiology, Bulletin of Science, Technology & Society. Leadership and Management and Engineering Environmental Science & Technology, Journal of Environmental Engineering, Hydrological Science and Technology, and Environmental Engineering Science. Dr. Vallero is an editor of the esteemed journal, Process Safety and Environmental Protection, serves as consulting editor for environmental engineering to the McGraw-Hill Yearbook of Science and Technology and the Encyclopedia of Science and Technology, and is guest editor of Ethics in Biology, Engineering and Medicine. His articles appear in encyclopedias, handbooks and engineering manuals.Dr. Vallero holds a Ph.D. in Civil and Environmental Engineering from Duke University, a Masters in Environmental Health Sciences (Civil and Environmental Engineering) from the University of Kansas, a Masters in City and Regional Planning from Southern Illinois University, and a Bachelors Degree in the Earth Sciences and Psychology from SIU.