He was born in Westfield, Massachusetts, later moving to Great Barrington where, aside from his trade as a hatter, he also served as constable and tax collector. In 1775, he married Elizabeth Dewey. He served as a lieutenant in the American militia from 1777 to 1781 and continued to serve in the Great Barrington militia after the American Revolution, reaching the rank of major.
After the death of his first wife in 1784, when Laura (his eldest daughter) was eight, he married on 26 May 1785, Mercy Smith, the widow of Josiah Smith. After the death of his second wife, he married Sarah Whiting, the widow of John Backus, in 1789.
Ingersoll immigrated to Upper Canada after hearing about the availability of land there for new settlers. In 1793, he obtained a land grant of 66,000 acres (267 km²) in Oxford County from Governor John Graves Simcoe. He named the new settlement Oxford-on-the-Thames. Ingersoll was named a justice of the peace for the county.
By November, 1795, Ingersoll had once again uprooted, moving to Queenston, Upper Canada and operating one of the earliest taverns before putting it up for sale in 1801.
Thomas Ingersoll emigrated to Upper Canada from the United States in 1795. He operated a tavern in Queenston before settling on his land grant in Oxford County.
In 1806, he left the settlement at Oxford-on-the-Thames and settled on the Credit River near Port Credit, operating "Government House" until his death in 1812.
His farm is the site of today's town of Ingersoll, His son Charles renamed Oxford-on-the-Thames "Ingersoll" in his honor.
His daughter, Laura Secord, was a heroine of the War of 1812. 
1st Marriage: 28 Feb 1775 Great Barrington, Berkshire, Massachusetts. Maj Thomas M Ingersoll 1750–1812 and Elizabeth Dewey 1758–1784
2nd Marriage: 26 May 1785 Great Barrington, Berkshire, Massachusetts, United States. Maj Thomas M Ingersoll 1750–1812 and Mercy Smith 1752–1789. No Children
3rd Marriage: 20 September 1789 Great Barrington, Berkshire, Massachusetts, United States. Maj Thomas M Ingersoll 1750–1812 and Sarah Whiting 1762–1832
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Thomas is 12 degrees from Alexander Hamilton, 9 degrees from Aaron Burr, 18 degrees from Gilbert du Motier de La Fayette, 13 degrees from John Laurens, 11 degrees from Mary Mathieu, 13 degrees from George III Hanover, 12 degrees from George Washington, 25 degrees from Jean-Baptiste Vimeur, 11 degrees from Henry Knox and 18 degrees from Michael Butler on our single family tree. Login to find your connection.
Categories: Migrants from United States to Canada | Great Barrington, Massachusetts | Patriotic Service, Massachusetts, American Revolution | Saint Marys Cemetery, St. Marys, Ontario | Oxford Upon the Thames Township, Upper Canada | American Revolution Militia Officers | Loyalists, American Revolution