David Peakall, English chemist and toxicologist (born 1931)

David Beaumont Peakall was an internationally recognised toxicologist. His research into the effects of DDE and DDT on eggshells contributed to the ban on DDT in the United States. He proved that the chemicals caused thinning of eggshells, leading to a reduction in the population of various bird species. He also pioneered research on the effects of PCBs on birds.