Nicklaus Welty, CPG, PG, director of site investigations for Arcadis North America, specializes in dynamic, adaptive, high-resolution site investigations with real-time three-dimensional hydrostratigraphic and plume modeling, and leads the Arcadis-wide training initiative to improve high-resolution site characterization methods for geologic, permeability, and contaminant mapping. He has led the first commercial applications of several advanced site characterization tools and strategies, and has presented internal and external workshops to regulators, clients, and consultants on innovative site characterization strategies and. Welty coauthored the upcoming second edition of Remediation Engineering: Design Concepts, which explores the history and future of remediation.