Dr. Subhas K. Sikdar, now retired, was the Associate Director for Science for the National Risk Management Research Laboratory of the U.S. EPA in Cincinnati, Ohio until 2015. Before joining EPA in 1990, Dr. Sikdar held managerial positions at the National Institute of Standards and Technology in Boulder, Colorado, and General Electric Corporate Research & Development Center in Schenectady, New York. Dr. Sikdar earned his M.S. and Ph.D. in chemical engineering from the University of Arizona. Dr. Sikdar is a Fellow of the American Association for the Advancement of Science (AAAS), Fellow of American Chemical Society (ACS), Fellow of the American Institute of Chemical Engineers (AIChE), Honorary Fellow of the Indian Institute of Chemical Engineers (IIChE), winner of five EPA bronze medals, two R&D 100 awards , AIChE’s Van Antwerpen Service to the Institute Award, AIChE’s Larry Cecil Award for Environmental Chemical Engineering, AIChE’s Sustainability Achievement Award, Distinguished Professional Service Award from EPA, and Distinguished Engineering Alumnus Award from both University of Arizona and University of Calcutta. He served as a member of the Board of Governors of the Council for Chemical Research (CCR) and of the Green Chemistry Institute. He served as the Founder/Chair of Sustainable Engineering Forum, Chair of Institute of Sustainability, and Chair of the Engineers’ Forum for Sustainability (ESF). For 25 years he championed the concepts and methods for clean products and processes for the Agency, in NATO projects, and in various engineering workshops that he organized. He is the founder and the co-Editor-in-Chief of the international journal, Clean Technologies and Environmental Policy (Springer), and served as the section Editor of Current Opinions in Chemical engineering 2011-2014 (Elsevier). Currently he is a member of the steering committee of Engineering Conferences International (ECI). Dr. Sikdar has published more than 100 technical papers in reputed journals, has 27 U.S. patents, and has edited 16 books including as a section editor of Encyclopedia of Sustainable Technologies (Elsevier, 2017). His contribution to scientific sustainability, Measuring Progress towards Sustainability, was published as a book by Springer in 2016.