Greg N. Stephanopoulos (born  1950) is an American chemical engineer and the Willard Henry Dow Professor in the department of chemical engineering at the Massachusetts Institute of Technology. He has worked at MIT, Caltech, and the University of Minnesota in the areas of biotechnology, bioinformatics, and metabolic engineering especially in the areas of bioprocessing for biochemical and biofuel production. Stephanopoulos is the author of over 400 scientific publications with more than 35,000 citations (h index = 97) as of April 2018.  In addition, Greg has supervised more than 70 graduate students and 50 post-docs whose research has led to more than 50 patents. He was elected a fellow of the American Association for the Advancement of Science (2005), a member of the National Academy of Engineering (2003), and received the ENI Prize on Renewable Energy 2011.