Prior to being knighted in 1608, Crompton is easily confused with John Crompton (d.1610), his uncle and predecessor as steward of Beverley.
Thomas was anxious to ensure that his heirs continued to receive the profits of the chirographer’s office after his death, and to that end he procured three reversions in the names of trustees, one of whom was Sir John Morley*. These came to Crompton on the death of his elder brother in 1606,
Returned for Brecon Boroughs in 1614, presumably thanks to the support of the remainder of the former Essex affinity in Wales, Crompton was named to only one committee in the Addled Parliament, on 8 Apr., for the bill to continue or repeal expiring statutes. He was mentioned on 5 May by Francis Ashley, who stated that prior to the start of the session Sir Reginald Mohun* had told him, in Crompton’s presence, that he had heard that there was an undertaking to manage the Parliament, and that this was ‘approved to his face’ by Crompton. On 9 May Crompton made his only recorded speech of the Parliament, although it is ascribed to his dead brother. Responding to the claim of the chancellor of the duchy of Lancaster, Sir Thomas Parry*, that the petitioners who had accused Parry of interfering in the Stockbridge election were guilty of ‘sundry misdemeanours’, Crompton demanded that the chancellor name his sources.
1614 also saw the publication of Christopher Brooke’s poem The Ghost of Richard the Third, dedicated to Crompton and his wife Frances, the daughter Sir John Crofts, a Suffolk knight.
On 22 Feb. 1621 Crompton was added to the sub-committee that had been appointed the previous day by the committee for courts of justice to receive petitions.
Crompton’s reversion of the chirographer’s office came to fruition on the death of Sir John Morley, the last of his father’s trustees, in December 1622. However, the following month Crompton assigned the position to Edward Wrightington*, retaining the profits for himself and agreeing to pay Wrightington £100 p.a.
