Matthew D’Ambrosia, PhD, PE, is a Principal with MJ2 Consulting, PLLC, with nearly two decades of experience in concrete materials behavior and research, including characterization of mechanical properties, development of new experiments, numerical modeling, and mixture optimization. His interests include materials optimization for specialized applications, durability-related mechanisms such as volume change and cracking, as well as new approaches to prediction and verification of service life, durability, and sustainability. He has expertise with large infrastructure and energy projects throughout the US, such as bridges, highways, dams, and power plants. His areas of research expertise include early age volume stability, creep and shrinkage of high-performance materials, self-consolidating concrete (SCC), fiber-reinforced concrete, shrinkage reducing admixtures (SRA) and internal relative humidity. He also has experience instrumenting and monitoring structural and material behavior in concrete bridges.