I came across this recent and promising intellectual biography of Tagore by Sabyasachi Bhattacharya.
Rabindranath Tagore: An Interpretation by Sabyasachi Bhattacharya is an attempt at an interpretative biography of Tagore. Instead of giving the mundane details of his day-to-day life, the writer weaves a fascinating account of Tagore’s struggle with the changing world around him. Bhattacharya’s basic motive is to unveil the life of the legendary figure while focusing on the intellectual evolution of his work. He tries to frame his work in the genres of biography and literary criticism — calling the result an intellectual biography. He admits that “to look at the interrelationship of the inner and outer life of Rabindranath Tagore is not easy for a biographer”.
Remembered as a poet and lyricist today, Tagore was also a thinker who greatly influenced his contemporaries and successors alike. The political and social atmosphere of his time helped form his philosophy of life. Empire and nation are two inseparable discourses that emerged out of the close contact between European imperialism and Third World nationalism.
A believer in the multi-faceted nature of humanity, Tagore was equally suspicious of imperialism and modern nation states and considered them as hindrances in cultural interaction. Although an eminent supporter of the Swadeshi movement, he never restrained from criticising the emerging discourse of nationalism in India for being guilty of chauvinism and parochialism. He believed in a balanced development of the individual, and by extension, the whole nation.
More here. Two more reviews appear here and here. I've just ordered my copy and hope to write a review at some point. I've been reading some additional works by Tagore lately, particularly his selected essays and his novel Gora, both of which I received as gifts from a friend.