Born onSeptember 1755, was the eldest son of John Field, an apothecary in extensive practice in Newgate Street, London, by his wife, Anne, daughter of Thomas Cromwell, grocer, who was a grandson of Henry Cromwell, lord deputy of Ireland. He succeeded his father in his profession, and in 1807 was elected apothecary to Christs Hospital, a post which he continued to fill until within a short time of his death.
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Source: Wikipedia