The personality shown in the given picture is Dadabhai Naoroji, a prominent Indian nationalist and economist.
The "Drain of Wealth" refers to the transfer of India’s wealth to Britain under British colonial rule, without any economic or material return to India. This wealth was extracted through various means, including remittances, trade profits, and the export of goods, which contributed to India’s impoverishment while financing Britain’s industrial development.
The book written by Dadabhai Naoroji is "Poverty and Un-British Rule in India", in which he elaborated on the economic exploitation of India by the British and the resulting impoverishment of the Indian population.