Rajib Mallick, PE, has extensive experience with asphalt materials, mixture design, construction, pavement design, recycling, and nondestructive testing. From 1992 to 1998, he worked as a research assistant and as a senior research associate at the National Center for Asphalt Technology (NCAT) and is currently a Visiting Professor of Civil and Environmental Engineering (CEE) at the University of Texas at El Paso. He has completed numerous research projects for several departments of transportation, the Federal Highway Administration (FHWA), the Massachusetts Port Authority (Massport), the National Science Foundation (NSF), the Federal Aviation Administration (FAA), and several private practitioner organizations. Dr. Mallick has coauthored more than 100 papers for journals and conference proceedings, as well as several practical reports, manuals, and state-of-the-practice reports for federal, state, and local highway agencies. Dr. Tahar El-Korchi is a professor and head of civil and environmental engineering at Worcester Polytechnic Institute. He does research and teaches courses on pavement analysis, design and management, construction materials testing and evaluation, cement and concrete materials and construction processes, structural analysis and design, and high-performance structural materials at the undergraduate and graduate level. He has published more than 80 publications and presentations and has served at numerous WPI global project centers, including Puerto Rico; Washington, District of Columbia; Morocco; Costa Rica; and Panama. Dr. El-Korchi was granted the prestigious Presidential Young Investigator Award by the National Science Foundation in 1991. Dr. El-Korchi is also a consultant to several major corporations. He provides recommendations for the design and evaluation of pavements, materials, and structures.