Ennio Macchi is Emeritus Professor at Politecnico di Milano. He has been full professor of “Energy Conversion? at Politecnico for over 30 years and was the first Director of the Energy Department of Politecnico. He was the founder and the scientific coordinator of the internationally recognized Research Group “GECoS? of the Politecnico di Milano. In the ‘70s, together with his colleagues Prof. Angelino and Prof. Gaia, he initiated the successful Italian activity on ORC. He is the author of more than 200 papers and books on various energy topics and consultant of several Companies, including ORC manufacturers.