John George Lambton, 1st Earl of Durham, GCB, PC (12 April 1792 – 28 July 1840), also known as "Radical Jack" and commonly referred to in Canadian history texts simply as Lord Durham, was a British Whig statesman, colonial administrator, Governor General and high commissioner of British North America. A leading reformer, Durham played a major role in the passage of the Reform Bill of 1832. He later served as ambassador to Russia. He was a founding member and chairman of the New Zealand Company that played a key role in the colonisation of New Zealand. George Woodcock says that he was, "Proud, wayward, immensely rich, with romantic good looks and an explosive temper." He was one of those "natural rebels who turn their rebellious energies to constructive purposes. Both at home and abroad he became a powerful exponent of the early nineteenth-century liberal spirit."
Durham was first elected to Parliament for County Durham in the general election of 1812, a seat he held until 1828, when he was raised to the peerage as Baron Durham, of the City of Durham and of Lambton Castle in the County Palatine of Durham. In Parliament he supported liberal causes, from the defence of Queen Caroline to the removal of political disabilities on Dissenters and Roman Catholics. When his father-in-law Lord Grey became prime minister in 1830, Durham was sworn of the Privy Council and appointed Lord Privy Seal. Along with Lord Russell he was a leading promoter of reform. He helped draft the famous Reform Bill of 1832. It reformed the electoral system by abolishing tiny districts, gave representation to cities, gave the vote to small landowners, tenant farmers, and shopkeepers and to householders who paid a yearly rental of £10 or more and some lodgers.
Lord Durham resigned from cabinet in 1833. Later the same year he was further honoured when he was made Viscount Lambton and Earl of Durham. Between 1835 and 1837, he served as Ambassador to Russia. While in Russia, he was invested as a Knight of the Order of St. Alexander Nevsky, of the Order of St. Andrew and of the Order of St. Anna. In 1837, he was appointed a Knight Grand Cross of the Order of the Bath.