The modern era of forensic anthropology arguably began with the work of Wilton M. Krogman (USA), who popularized the use of facial reconstructions in forensic criminal investigations. By mapping tissue of varying thicknesses to cranial (skull) remains, Krogman was able to build a clay model closely resembling the deceased. Although forensic facial reconstruction – now possible on computer – continues to prove successful, data obtained via this method is not admissible in US courts, as no two completed reconstructions are ever the same.