Ivan Diaz is Vice President of Research and Product Development at Eco Material Technologies. He holds a Ph.D. from Louisiana Tech University and has more than 15 years of experience in cementitious materials. He is the chair of ACI Committee 232, Coal Ash in Concrete and is a member of Committees 240, Natural Pozzolans, 236, Material Science of Concrete and 242, Alternative Cements. He is also a member of ASTM Committees C01 on Cement and C09 on Concrete and Aggregates. His career has focused on evaluating characteristics and performance of supplementary cementitious materials in concrete, alternative supplementary cementitious materials, and evaluating the technical soundness of new materials and processes for the concrete industry.