Pennington was born in Kendal, Westmoreland on 23 February 1777 and died in Clapham on 23 March 1862. He was the third of five children born to William Pennington, a bookseller, printer and architect who became mayor of Kendal, and his wife Agnes Wilson, the daughter of a clockmaker. At the Quaker school in Kendal, Pennington studied under George Bewley, a teacher proficient in higher mathematics, and John Dalton, who later became a professor of mathematics and natural philosophy at Manchester. After schooling, Pennington moved to London, where he pursued a business career. In November 1811 he married Mary Anne Harris, who was to bear him four sons and three daughters. Upon marriage, Pennington moved from London to his wife's hometown of Clapham, where he lived for the rest of his life (Sayers 1963).
From The Biographical Dictionary of British Economists in Oxford Reference.