(2) Richard Dawkings : is a Britishethnologist and evolutionarybiologist. Alan Greenspan : is an Americaneconomist who served aschairman of the Federal Reserveof the United States from 1987to 2006. Vernon Heywood : is a renownedBritish biologist. His main fieldsof excellence are medicinal andaromatic plants, and the conservationof wild relatives of plants. Olivar Sachs : is a British neurologistresiding in New York city. Stephan Howking : is an Englishtheoretical physicist and cosmologist,whose scientific books andpublic appearances have madehim an academic celebrity.