Who wrote the book ‘Reminiscences of the Nehru Age’?

‘M.O. Mathai’ is the author of the famous book ‘Reminiscences of the Nehru Age’.
M.O. Mathai, Nehru’s Special Assistant and alter ego between 1946 and 1959, was reputed to be the most powerful man after the Prime Minister during the years that he served Nehru.
Mathai was the only one to know everything about Nehru, most especially the first Prime Minister’s private thoughts about Politics, Congress leaders, Bureaucrats, Money, Women, Sex, Alchohol along with much else that attracted his attention off and on.