Mary Mellor is Professor Emerita at Northumbria University in the UK, where she taught social theory and was founding Chair of the University’s Sustainable Cities Research Institute. Throughout her academic career, Mellor has been concerned with the need for social change. Her initial research area was the social economy, with a focus on cooperatives. In the 1980s, her exploration of the ecofeminist movement resulted in two books, Breaking the Boundaries and Feminism and Ecology. In the 1990s, she developed her current area of interest, alternative economics, combining environmental, socialist, and feminist ideas. This led to a fundamental rethinking of how current economies function, particularly with regard to the role of money, manifest in the books The Politics of Money (co-authored), The Future of Money, and Debt or Democracy. She is currently working on a new book on the history of money.