Reynell was born at Rivershill near Binstead, Hampshire in 1636, and died in London in 1640. His father's family came from Devon, and both his father and grandfather had served as marshal of the King's Bench. Reynell entered Wadham College, Oxford as a gentleman commoner in 1652; leaving in 1654 without taking a degree, he enrolled at the Middle Temple. At some point during the ensuing year he became associated with the royalist group led by John Penruddock, which launched an abortive rising at Salisbury in 1655. This was put down by the army and the ringleaders were executed; Reynell was arrested and imprisoned at Exeter, and was released only after his father petitioned for his released and agreed to provide assurances for his future good behaviour. Reynell spent the next two years overseas, probably in France, but upon his father's death he returned home to Rivershill and lived there quietly. He welcomed the Restoration, but made no further move to get involved in politics; thereafter he divided his time between his business interests in London and his country estate.
From The Biographical Dictionary of British Economists in Oxford Reference.