Tim McGrath spent almost 40 years with Simpson Gumpertz & Heger Inc. Before becoming Principal with TJMcGrath, LLC. Most of his career has been involved in research, design and investigation of gravity flow pipes and culverts. He is past Chair the AWWA Committee on fiberglass pipe and the TRB Committee on Culverts and Hydraulic Structures. He often advises the AASHTO Committee on Culverts on proposed modifications to material and design standards.
Ian Moore is Canada Research Chair in Infrastructure Engineering at Queen’s University, Canada and Editor of the Canadian Geotechnical Journal. He is founder and director of the GeoEngineering Laboratory at Queen’s University - North America’s (and likely the world’s) most active and influential laboratory specializing in buried pipe infrastructure.