Dr. Perko has 25+ years of engineering experience and holds B.S., M.S., and Ph.D. degrees in Civil Engineering with Geotechnical/Foundation Engineering specialization. He is a licensed professional engineer in 20 states and his project experience includes foundation designs, slope stabilization, excavation shoring, earth retention, and underpinning. Much of his experience has been with CTL|Thompson, a 300 person consulting firm headquartered in Denver, Colorado, where he served as a member of the management committee. He currently serves on the board of directors for Magnum Geo-Solutions, LLC, the engineering and technical support group associated with Magnum Piering, Inc. You can read more about the book and Dr. Perko on the official book website, www.helicalpilebook.com.