 His professionalism was well regarded by his colleagues and the Prime Ministers Nehru and Indira Gandhi.Handsome, incorruptible, suave and intellectual, Rameshwar was a shy and humble person.Count Alexandre de Marenches, erstwhile head of the French external intelligence agency, or SDECE (Service For External Documentation And Counter-Intelligence) as it was then known, named Kao as one of the 'five great intelligence chiefs of the 1970s'.