Raja Rammohan Ray was the first Indian to effectively express himself in black and white through English though he was initiated to the language when he was in his teens. Thereafter Vivekananda showed his perfect masterly over the language through his evocative prose, which made the west sit up and take notice of the greatness of Hinduism.
Tagore also had written some poems in English. However, there is no denying the fact that Indian writings in English were extremely few far between. Jawaharlal Nehru and M.K. Gandhi were also great masters of the English language. Nehru's Discovery of India, Glimpses of World History etc. are glaring testimony to not only his profound scholarship but also his absolute mastery over writing lucid prose in the foreign language. Gandhiji used the language in his writings with utmost precision and desterity.
They were followed by the great triumvirate of Anand-Rao-Naryan, who were the first to make Indian writing in English popular among a sizable section of our English educated people. They primarily wrote fiction and their elegant styles soon caught the imagination of the common reader. Indian writing in English had finally arrived in 1930's after a marginal existence for over a century.
Mahatma Gandhi: Though Gandhi used his mother tongue, Gujarati, to write his famous autobiography, later translated into English by his secretary Mahadev Desai under the title The Story of My Experiments with Truth (1929), he used Hindi and English with masterly skill and use. As he lived through a eventful life among his people, who were attempting to liberate themselves from moral decadence, economic exploitation, and cultural subordination, Gandhi wrote, day and night, in and out of prisons, for his two journals, Young India and Harijan.
Rabindranath Tagore: The national awakening in Asia found its expression first in the Indian literature, and its foremost representative writer was Tagore