Alberto Granado was born in Hernando, Province of Cordoba in 1922. From December 1951 to July 1952 he travelled, after attending the University of Cordoba, all over Latin America with Ernesto Guevara de la Serna. When the dictator Perez Gimenez was ousted in Venezuela he was put in charge of the reorganisation of the School of Bioanalysis of the University of Caracas where he worked until 1961. He then went to live in Cuba where he worked at various universities. He is at present a consultant with the Department of Genetics at the National Health Centre for Stockbreeding and Farming. Luc-a Alvarez de Toledo grew up and was educated in Argentina and was awarded a Scholarship at the University of Delhi. Having worked as a journalist and broadcaster she settled in London in 1968 and established herself as a professional interpreter and translator, working at the highest levels for Governments, Corporations and international institutions. Her background, knowledge of South America and long-standing friendship with Alberto Granado have enabled her to bring a unique understanding to the first English language translation of this book.