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- Not to be confused with "Joseph Cameron Gardner", professional baseball pitcher for the Caracas Lions.
In 1776 Gardner raised and commanded the Fourth Battalion of militia in Chester County. He also served on the county's Committee of Safety in 1776-1777, and as a representative in the Pennsylvania state assembly from 1776 to 1778. In 1779, he was member of the state's supreme executive council. Pennsylvania sent him as a delegate to the Continental Congress twice, in 1784 and 1785. Throughout this time, he continued the practice of medicine.
Gardner moved to Elkton, Maryland in 1792, and also practiced as a physician. He died at Elkton in Cecil County, Maryland in 1794. Joseph was married to Isabel Cochran (1747–1794), but there is no record of any children.
| Member, Supreme Executive Council of Pennsylvania, representing Chester County
23 October 1779—2 November 1782