May has held subsidiary appointments as executive trustee of the Nuffield Foundation, member of the board of the United Kingdom Sports Institute, foundation trustee of the Gates Trust (University of Cambridge), chairman of the board of trustees of the Natural History Museum, trustee of the Royal Botanic Gardens, Kew, independent member of the Joint Nature Conservation Committee, trustee of World Wildlife Fund-UK, president of the British Ecological Society, and member of the Committee on Climate Change.