I have 35 years of experience, and specialize in the field of forensic photogrammetry and geodesy with specific knowledge in the areas of 3-D reconstruction from photos, both aerial and snapshots; geodetic subsidence in South Louisiana and coordinate systems and datums of the World. I have published on such topics as forensic photogrammetry, grids and datums of the World, and elevations and flooding in Louisiana. I have testified 50 times on topics such as forensic photogrammetry, geodesy and coordinate systems.