"The loudest warnings about the predicted peak of world oil production came from Petroconsultants. In a late 1998 merger, Petroconsultants became IHS Energy Group, a subsidiary of Information Handling Services Group (IHS Group), a diversified conglomerate owned by Holland America Investment Corp., IHS Group's immediate parent company, for the Thyssen-Bornemisza Group (TBG, Inc.)."

See: Walt Sheasby article (2003-12)