Johannes "Hans" van Leeuwen (born 1946 in Gouda, South Holland) is educator, engineer, inventor, researcher, and entrepreneur. He is an emeritus professor of Civil, Construction and Environmental Engineering at Iowa State University and an entrepreneur in ethanol co-product development. His research and innovations have worked to solve various problems including, new water purification methods, a way of creating food and animal feed from waste, and a process in making the purest alcohol ever made.
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