Dan Valentine joined Simpson Gumpertz & Heger Inc. (SGH) in 1995 as a member of the firm’s Engineering Mechanics and Infrastructure group and specialized in soil-structure-interaction analysis of buried structures, with an emphasis on large-diameter pipelines, as well as analysis of other complex structural behavior. Although he temporarily left the firm in 2000 to pursue his law degree in Arizona, he returned to SGH in 2003 to resume his engineering career while simultaneously obtaining a second law degree. Throughout his tenure at SGH, he has been involved in many structural investigations and has performed the analysis and design of numerous complex structures, including nuclear facilities, large-diameter pipelines, water and fuel storage tanks, and precision structures, including steerable radar antennas. He currently specializes in finite-element modeling of complex structural behavior and performing linear- and nonlinear-structural analysis. In addition to his technical work, he is also the head of SGH’s Nuclear Quality Assurance Program. In this capacity, he handles revisions and updates to corporate policies and procedures, coordinates both internal and external audits of the program, and is charged with the overall implementation of the program.