Michael A. Twohig is a world-renowned, published expert in the field of Subsurface Utility Mapping (SUM). Michael has more than 36 years of industry experience across the US, Australia, India and Europe, with a focus on the integration of traditional utility locating procedures with land survey best practices. As head of Subsurface Utility Mapping (SUM) at DGT, Michael spearheads the firm’s subsurface utility locating, 3D utility mapping and subsurface utility damage prevention programs. In the span of his career, Michael has authored more than 40 articles relating to utility mapping, underground damage prevention, and utility industry best practices, and he is a frequent speaker at international conferences. One of Michael’s greatest achievements is the advancement, development and implementation of new 3D deliverables for geospatial projects, integrating LiDAR, utility locating systems, GPR, infrared, land surveying, and multi-sensor platforms to provide high quality, reliable and accurate data for CAD, GIS and BIM delivery format.