Jonathan Carver was born in Weymouth, Massachusetts, on April 13, 1710, the son of local government official, David Carver, and his wife, Hannah Dyer. As a child, he moved with his family to Connecticut, and there, he married Abigail Robbins in 1746 and worked as a shoemaker. They later settled in Montague, Massachusetts, and had at least seven children. In 1755, Carver joined the colonial militia and he subsequently fought in the French and Indian War, serving in engagements at Crown Point, Lake George, Fort William Henry (where he was briefly imprisoned), and Fort Edward. In 1763, he left the Army and set out to explore the territories newly acquired from the French, armed with some knowledge of drafting, mathematics, and trade. By this time, he had befriended the popular solider and frontiersman, Major Robert Rogers.
In August 1766, Carver traveled to Fort Michilimackinac in Michigan, where Rogers, who was commander there, contracted him to search for the Northwest Passage and to encourage Native Americans to conduct their trading at Michilimackinac. Carver traveled to Green Bay, Wisconsin, and up the Fox and Wisconsin Rivers to the Mississippi River. In the winter of 1766-1767, he lived among the Naudowessie Indians and encouraged them to engage in fur-trading at Michilimackinac. In the spring of 1767, Carver awaited supplies to be sent by Rogers, but the latter had come under suspicions of plotting treason with France against England, and was arrested in December 1768, leaving Carver with little to show for his two years of exploration.
Carver left for England in 1769 to petition the British government for payment to cover his expedition to find the Northwest Passage, and eventually received about £1300. Needing additional funds, he fabricated a land grant by the Naudowessie Indians for property actually owned by their enemies, the Ojibwe, in Wisconsin. In 1774, despite having a wife in America, he married a British woman, Mary Harris, with whom he had two children. In 1778, he published Travels through the Interior Parts of North America in the Years 1766, 1767 and 1768, based on the journals he kept during his journey. He died in 1780.
Robert Rogers was born in Methuen, Massachusetts, on November 7, 1731, the son of Irish parents, James Rogers and Mary McPhatridge (sometimes spelled McFatridge or McPhetridge). Rogers grew up primarily in Dunbarton, New Hampshire, and worked as a trader until charged with counterfeiting; he escaped prosecution by enlisting in the New Hampshire regiment in the French and Indian War in 1755. Roberts moved up the ranks of the army, first serving as a captain in the Crown Point expedition, and then gaining fame as the commander of a group of 600 irregular troops, called "Rogers' Rangers," who used guerrilla-like tactics and worked individually and in small groups to oppose the French. In 1761, he married Elizabeth Browne, daughter of Reverend Arthur Browne. In the same year he fought the Cherokees in South Carolina, and in 1763-1764, served in Pontiac's War.
In 1765, Roberts traveled to England in order to obtain money to pay off debts he had incurred in North America. There, he published his journals and a work entitled A Concise Account of North America, and wrote a play about Pontiac, Ponteach. After an audience with King George III, who had read his works on North America, Roberts obtained the post of commander at Fort Michilimackinac in present-day Michigan, and an assignment to find a passage to Pacific Ocean. In December 1768, Robert was arrested and court-martialed on suspicion of intrigue with the French. He was acquitted, but imprisoned for debt upon his return to England in 1769. He again traveled to America in 1775, where he raised the Queen's American Rangers regiment and served as a spy for the British. In 1778, his wife divorced him; two years later, he returned to London, where he died in 1795.
Richard Whitworth was born in England in 1734. He attended Eton and subsequently graduated from Trinity College, Cambridge, in May 1752. Whitworth was a man of some financial means; he oversaw a large estate at Bathacre Grange, Stafford, and acted as a landlord for a number of tenants in the area. By many accounts a strongly opinionated, fierce individual, Whitworth was involved in local political affairs and offices throughout his life, serving as sheriff of Staffordshire from 1758-1759 and again from 1791-1792. Whitworth successfully stood for Parliament in 1768, representing Staffordshire in the House of Commons until 1780. For the early part of his career, Whitworth voted primarily with the opposition, but by 1774 he was considered a supporter of the government; by 1779 he was receiving a secret service pension from Lord North. Whitworth had a strong fascination with inland navigation, evidenced by a series of private canals he constructed on his property, as well as his efforts, in 1774, to persuade Parliament to fund a scheme of his friends, Jonathan Carver and Robert Rogers, to explore the Northwest Passage. After his time in Parliament, Whitworth was involved in a number of legal disputes, leading him to fortify his home with guns and a martello tower, leading to its nickname, "Castle Whitworth." Whitworth died in 1811.