Dr. Gregory S. Parnell is a Professor of Practice and the Director of the System Design and Analytics Laboratory (SyDL), Department of Industrial Engineering, University of Arkansas. His research focuses on decision analysis, systems engineering, risk analysis and resource allocation. He is the editor of Trade-off Analytics: Creating and Exploring the System Tradespace (2016), editor of Decision Making for Systems Engineering and Management (3nd Ed, 2022), and lead author of the Handbook of Decision Analysis (2nd Ed, 2025). He is a fellow of the International Committee for Systems Engineering, the Institute for Operations Research/Management Science, and the Military Operations Research Society. He served as Editor of Military Operations Research. He is past president of the Military Operations Research Society and the Decision Analysis Society. He has a Ph.D. from Stanford University, is a Certified Systems Engineering Professional, and is a retired Air Force Colonel. He has served on five committees of the National Academy of Sciences, Engineering, and Medicine.