John Haddock is a registered professional engineer and a professor of civil engineering at Purdue University, where he also serves at the director of the Indiana Local Technical Assistance Program (LTAP). Prior to joining the Purdue faculty, Dr. Haddock worked in private industry as a pavement engineer, as a senior research associate for the National Center for Asphalt Technology, as a research engineer for the Indiana Department of Transportation, and as a district engineer for the Asphalt Institute. During his career he has worked in research, equipment and test method development, and criteria and specification writing. He has been responsible for asphalt mixture design production, forensic pavement investigations, and pavement design and analysis. Dr. Haddock is a member of the American Society of Civil Engineers, ASTM International, the International Society for Asphalt Pavements, and the Association of Asphalt Paving Technologists. He has served on several Transportation Research Board committees and is the past chair of AFK30, Committee on the Characteristics of Non-Asphalt Components of Asphalt Paving Mixtures. He currently serves as a member of TRB committee AKM10, Standing Committee on Production and Use of Asphalt. Dr. Haddock is the co-editor-in-chief of the ASTM International journal, Advances in Civil Engineering Materials.