David Alden is a Technical Associate with Tersus Environmental, where he provides technical support for Tersus’s portfolio of biotechnology-based solutions to manage complex, challenging environmental liabilities and reduce costs for site closure. He is a graduate of Universidad de las Americas-Puebla, Mexico, where he majored in Civil Engineering with a focus on waste-water treatment, and he holds registration as a Professional Engineer in North Carolina. Alden worked for 4 years in the upstream oilfield sector performing offshore well tests and completion design and installation in the Gulf of Mexico. He participated in the in situ oil-shale extraction experiment in the Piceance Basin in Northwestern Colorado, where protecting groundwater was the main challenge. Alden recently specialized in groundwater studies, completing a Master’s Degree at Joseph Fourier University in Grenoble, France.