[1] In February 1829 Parker was engaged, on Clowes's recommendation, as superintendent of the Cambridge University Press, which he made profitable.
In 1832 he left Clowes, and established himself at 445 Strand, where he was appointed publisher to the Christian Knowledge Society, and issued the Saturday Magazine.
Against opposition he introduced steam power, but the Bible Society long declined to purchase books printed by it.
He started a printing-office at the back of the Mews, Charing Cross, and later moved to St. Martin's Lane, where he took Thomas Richard Harrison into partnership, and ultimately relinquished the business to him.
Parker died at Warren Corner House, near Farnham, Surrey, on 18 May 1870, aged 78,[1] and is buried at Highgate Cemetery.