Biography
Son of Sir Joshua Vanneck (d. 1777), 1st Baronet Vanneck, of Putney,1 and Mary Anne Daubuz. He became 2nd Baronet Vanneck on the death of his father. He never married.
He was a merchant in London and an MP for Dunwich (1768-1790).
Life with Boswell
Boswell breakfasted with "Sir Joshua Vanneck's son and his Swiss governor" in Brunswick on August 11, 1764. The editors of Boswell on the Grand Tour I suggest this was Gerard Vanneck, but another possibility is his younger brother, Joshua Vanneck (1745-1816) who later became 1st Baron Huntingfield of Heveningham Hall. The younger Joshua succeeded his brother as MP for Dunwich in 1790.