My duty is to investors, says GrainCorp CEO, as senators attack ADM bid GRAINCORP chief executive Alison Watkins has told a Senate inquiry it was not her role to scrutinise the international corporate behaviour record of Archer Daniels Midland, when considering the US grain giant's $3 billion takeover bid. Under tough questioning from the Rural and Regional Affairs committee's chairman, New South Wales Senator Bill Heffernan, Ms Watkins said her primary responsibility as a GrainCorp director was to her shareholders in recommending the ADM takeover offer.