According to Baxter, he acted for a time as assistant to a certain Richard Conder, either in or near London;and in 1632 he obtained the living of Rugby, Warwickshire.
[1][2] In 1642 Nalton signed a petition addressed to Lord Dunsmore respecting the appointment of a master to Rugby grammar school.
He subsequently acted as chaplain to Colonel Grantham's regiment; and then about 1644 he was appointed incumbent of St Leonard, Foster Lane, London.
On 29 April 1646 he preached before the House of Commons at St Margaret's, Westminster, on The Delay of Reformation provoking God's further Indignation (London, 1646), his fellow preacher on this occasion being John Owen.
For a short period one of the ministers of the English Church at Rotterdam; but he returned to England by permission at the end of six months, and resumed his work at St Leonard's until he was ejected in 1662.