Philippe Grandjean is author of Only One Chance: How Environmental Pollution Impairs Brain Development - and How to Protect the Brains of the Next Generation. He is a professor and chair of environmental medicine at the University of Southern Denmark and an adjunct professor of environmental health at Harvard School of Public Health. He has spent his career studying how environmental chemicals affect children's brain development. His studies helped trigger an international response that led to a United Nations agreement to control mercury pollution. He has studied children in the U.S., Denmark and the Faroe Islands, as well as parts of South America and Asia, and has published about 500 scientific papers on his findings. He blogs at www.chemicalbraindrain.info.