Professor Ali Sayigh is Chairman and Founder of the World Renewable Energy Congress (WREC), Director-General of the World Renewable Energy Network (WREN), Chairman and Founder of the Arab Solar Energy Society, and Past Chairman of the UK Solar Energy Society. He actively consults on renewable and sustainable energy issues for several international organizations, including UNESCO, ISESCO, UNDP, ESCWA, and UNIDO. Dr. Sayigh was Director of Solar Seminars at ICTP Trieste, Italy from 1977 to 1995, and Professor of Solar Energy at King Saud University, Saudi Arabia, from 1969 to 1981. He was head of renewable energy at the Kuwait Institute for Scientific Research from 1981 to 1985, a founding expert on renewable energy at OAPEC from 1985 to 1987, Professor at Reading University from 1987 to 1994, and Professor at the University of Hertfordshire from 1994 to 2004. He was the founding Editor and Editor-in-Chief of the Renewable Energy journal from 1984 to 2014, and in 2017 helped establish and was Editor-in-Chief of the journal Renewable Energy and Environmental Sustainability. He is a Chartered Engineer and a Fellow of the Institute of Energy, the Institution of Engineering and Technology, and the Royal Society of Arts. Dr. Sayigh has published more than 300 papers and has contributed to and edited more than 30 books. He was the Editor-in-Chief of the multi-volume reference work Comprehensive Renewable Energy (Elsevier, 2012).