Our expert witnesses provide expert testimony for issues related to exposure to a hazard affect many parties. Risk managers in the firm with an inadvertent contamination, insurers, outside legal counsel, investors, state health officials, and particularly those affected by exposure to a hazard want to know not just where the hazard was found but also the number of persons, properties, and businesses affected over time. Are there a substantial number of persons exposed over time? Are property values in an area near the site up or down relative to similar areas in the same county? Is the rate at which property sales occurring near the site slower or faster than expected given the types of properties? Are commercial sales depressed because of the threat of the cost or importunity of remediation? All of these questions rely on knowing the impact of contamination on the population, which in turn requires knowing what population is, in fact, affected by proximity to such a site.