Joan Martinez-Alier is an activist, founder and promoter of the ideas of Ecological Economics in permanent conjunction with Political Ecology. He also created the concept of the ‘Environmentalismof the Poor’. that highlights the role of communities including peasants, fishers, ethnic groups, marginalized people in large cities, women and other populations, in environmental conservation.He also contributed to the creation of the International Society for Ecological Economics (ISEE) and the journal Ecological Economics. He is also the creator and director of the journal Ecologia Politicaand is one of the directors of the Global Atlas of Environmental Justice (www.ejatlas.org), whichmakes visible the resistance of populations and communities against extractivism and in generalagainst development that generates significant environmental impacts and injustice. In recognitionof his academic life, his many publications from which we have learned, a life of struggle, a life ofcommitment to nature and communities impoverished by development, we pay him this small tribute expressed in this accompanying biography to accompany the many other tributes and recognitionsthat have been made to him throughout his life.