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In page William Dummer Powell:

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Powell studied in Boston before being sent to England under the care of his maternal relative, Sir Alexander Grant, who sent him to board at Tonbridge School. Having in four years excelled at nothing other than cricket, he was next sent him to live with a merchant at Rotterdam where he was to learn French and Dutch while gaining a first-hand experience in business. Having returned to Boston in 1772, two years later he started his legal career in the offices of Jonathan Sewell, Attorney General of Massachusetts. After his marriage, he returned to England in 1775 where he studied law at the Middle Temple.