Cannon Silver Cannon Silver is a Principal Environmental Engineer with CDM Smith, located in Columbus, OH. He has worked in the environmental field since 1994. Cannon designs, installs, and optimizes innovative remedial systems for industrial and federal clients, and specializes in technology transfer. He has authored or co-authored more than 15 technical presentations on innovative technologies. He has installed and evaluated the performance of multiple permeable reactive barriers (PRBs) at Air Force and Navy sites. In 2011, Cannon prepared a document for the Navy, comparing the cost, performance, and sustainability of various types of PRBs. He has served on ITRCís PRB Update Team since 2008. Cannon earned a bachelor's degree in Mechanical and Materials Engineering from Harvard University in Cambridge, MA in 1993, and a masterís degree in Environmental Engineering from Stanford University in Palo Alto, CA in 1994, and is a registered professional engineer in California, Michigan, and Utah.