Paul C. Schmall, PhD, PE is a Vice President of Keller, an internationally recognized geotechnical contractor. He is the senior most groundwater control engineer , having spent his entire 32 year career in underground construction and tunneling. Over the course of his career, he has engineered and managed numerous technically complex projects, including more than 20 dewatering and stabilization projects for ash pond closure by removal and cap-in-place construction. He is proactive in advancing the state of the practice by sharing his experience and expertise with the engineering community through frequent seminar and conference presentations, the publication of technical papers, instruction of several short courses, and by serving on industry committees. Dr. Schmall is a co-author of the third edition of Construction Dewatering and Groundwater Control, published in 2007, and the 2015 recipient of the Wallace Hayward Baker Award for innovation in ground improvement.