Mohammad Najafi, Ph.D., P.E. is Assistant Professor and Director of Center for Underground Infrastructure Research, Trenchless Technology, Pipeline Construction & Renewal (CUIRE), at Michigan State University. From 1994 through 2002, he was the Technical Editor of No-Dig Engineering Journal.He is host of the 5th International Trenchless Technology Colloquium held in March 2003, and technical chair of ASCE International Pipeline Conference being held in July 2003 in Baltimore.Dr. Najafi is the co-editor of Trenchless Construction Methods and Soil Compatibility, and co-editor of the manual Trenchless Pipeline Rehabilitation, both published by the National Contractors Utility Association, as well as a research paper and the contribution of a chapter on Trenchless Technology for the Second Edition of Buried Pipe Design by Dr.Al Moser, published by McGraw-Hill in 2001.