Parke's early career as a barrister was not noted as particularly brilliant, but he was successful; in 1820, for example, he was junior counsel for the Pains and Penalties Bill 1820 against Caroline of Brunswick. On 28 November 1828 he succeeded Sir George Holroyd as a judge of the Court of King's Bench, a great achievement for somebody who had not even qualified as a King's Counsel, and he was knighted on 1 December 1828. In 1833 he was made a Privy Councillor, and on 29 April 1834 was transferred, along with Edward Hall Alderson, to the Court of Exchequer, succeeding and being succeeded as a judge of the Court of King's Bench by John Williams.