Who have been the presidents of US Borax?

US Borax, a subsidiary of Rio Tinto, has had several presidents since its founding. Notable presidents include John E. Hargrove, who led the company during its early growth, and more recently, individuals like John C. McNulty and others who have overseen its operations and expansions in the mining and chemical sectors. For a complete and up-to-date list, it would be best to refer to the company's official website or historical records.