Stafford (Staff) Sheehan is an American scientist and entrepreneur. He has founded, co-founded and developed core technology for companies that have generated more than US$250 million in investment and revenue, and employed over 300 engineers, scientists, operators, and other professionals. His businesses focus on commercializing high-value products to demonstrate technology, on a pathway toward scale, focusing on sustainability and low-carbon energy. He has been featured in Forbes, Chemical and Engineering News (C&EN) and MIT Technology Review, and has won awards from the United Nations, the US Environmental Protection Agency (EPA), National Aeronautics and Space Administration (NASA), BASF and others. He completed his PhD in physical chemistry at Yale.