Founder and Professor of Laboratory of Systems Ecology and Sustainability Science at Peking University, China, and Distinguished Professor in the Center of Research Excellence of Renewable Energy and Power Systems at King Abdullaziz University, Saudi Arabia. He has a wide spectrum of research interests including climate thermodynamics, computational fluid dynamics, heat, and mass transfer, renewable energy and resources, systems ecological modelling, ecological economics, global and regional sustainability studies, systems input-output technique. With distinguished contributions as marked by around 300 publications in prestigious journals, he has won a series of awards and honors, including Elsevier Atlas Award, Thomson Reuters Highly Cited Researchers Award, Thomson Reuters China Citation Laureate. He served as editor, associate editor or advisory member for 50 international journals.