Nadia Marchettini is a Professor of environmental and ecultural heritage chemistry in the Department of Chemical and Biosystems Technologies at the University of Siena, Italy.

Professor Marchettini received an MS in Biology and a Ph.D. Chemistry from the University of Siena where the professor’s research focuses on nonlinear dynamics, with applications in the fields of chemistry, biology and the environment, in the field of nulear magnetic resonance spectroscopy, applied to biological systems, and in the field of environmental chemistry, with particular attention to the role of photosynthesis and of entropy, to the energy analysis of biomass,and to the thermodynamic analysis and study of energy flow in the ecosystem, as well as  modelling the physical-chemical parameters involved in those processes that are of biological and environmental importance. She is associate editor of the WIT Press series Advances in Ecological Sciences.

Enzo Tiezzi was a full professor of Physical Chemistry at the University of Siena and author or co-author of five other books in the field of sustainability published by WIT Press (The End of Time, The Essence of Time, Beauty and Science, Steps towards an evolutionary physics, and City out of Chaos) , as well as some 500 articles published in major scientific journals.

A former Fulbright scholar, he was a member of the group of 25 scientists, who developed the concept of "sustainable development", first in Stockholm and Barcelona, then at the World Bank in Washington and, finally, at the ASPEN Institute in the United States. He also served as an editor of the International Journal of Design & Nature and Ecodynamics and chief editor of the WIT Press series The Sustainable World.