Career
He travelled to India at a young age and began to work, unpaid, for the East India Company at 13. Wynch became governor of Madras in 1773. He was removed as Governor in 1775, in the wake of his handling of the affair of Thuljaji, the Rajah of Thanjavur (Tanjore), who in fighting in south India had been dispossessed by Muhammed Ali Khan Wallajah, the Nawab of Arcot.
The Company disapproved of the change in the previous policy of ensuring the Rajah and Nawab were bound by treaty.
Wynch was replaced in 1775 by George Pigot, 1st Baron Pigot, Governor some years before, who was sent out from England. In England, Wynch lived in Upper Harley Street in London, and then Gifford Lodge in Twickenham.
He died at Westhorpe House in Little Marlow, Buckinghamshire.