Lord Peter Melchett, the former head of Greenpeace U.K., has accepted a position with the public relations company Burson-Marsteller, which numbers among its clients the pesticide and food company Monsanto. Long a leading target for green groups, Monsanto is currently drawing fire for its production and promotion of genetically modified (GM) foods. Melchett, who led the Greenpeace campaign to eradicate GM crops and was once arrested for attacking a field of GM maize, will advise the PR company’s Corporate Social Responsibility unit on environmental issues.