Chau-Chyun Chen, ScD, is a professor in the Dept. of Chemical Engineering and the Jack Maddox Distinguished Chair in Sustainable Energy at the Edward E. Whitacre Jr. College of Engineering, Texas Tech Univ. (Phone: (806) 834-3098; Email: chauchyun.chen@ttu.edu). A co-founder of Aspen Technology, Inc., he is the inventor of process simulation software and is known for developing the electrolyte NRTL activity coefficient model for electrolyte thermodynamics. His research aims to advance molecular thermodynamics and process simulation for adsorptive and membrane-based separations, CO2 capture, desalination, electrochemical systems, and more. He has written over 120 publications and book chapters and holds 18 U.S. and international patents. Chen received his BS in chemistry from National Taiwan Univ. and MS and ScD in chemical engineering from the Massachusetts Institute of Technology. He is a fellow of AIChE and was elected to the National Academy of Engineering in 2005.