Browne’s father obtained ecclesiastical preferment after a distinguished academic career at Cambridge, and acquired property in several counties. Browne became a lawyer, purchasing Arlesey in 1646. Until Pride’s Purge he followed closely in the footsteps of his cousin Oliver St. John, taking an effective part in the prosecution of Archbishop Laud and acting as chairman of the committee to investigate allegations of treachery against the leaders of the peace party at Westminster. He was made a judge in 1648, but refused to act after Pride’s Purge and held no office under the Commonwealth. Although he had been a Presbyterian elder, he came under the influence of Archbishop Ussher during the Interregnum.3Beds. Hist. Rec. Soc. ii. 139; VCH Beds. ii. 262; Keeler, Long Parl. 119-20; D. Underdown, Pride’s Purge, 20. 68, 72, 203; Whitelocke Mems. ii. 459, 522.
Browne was returned for Bedfordshire unopposed at the general election of 1660. A moderately active Member of the Convention, he was appointed to 18 committees, including those to manage the conference on the King’s letter on 1 May, to consider the land purchases bill and the indemnity bill, and to prepare for two conferences about the jurisdiction of the Lords. In his only speech (on 4 July) he opposed requiring those who claimed the benefit of the indemnity bill to take the oaths of allegiance and supremacy. He also served on the committee for settling ecclesiastical livings. Presumably he gave satisfaction to the Court, for he was raised to the bench during the autumn recess. His patent as judge of common pleas passed the seal on 3 Nov., but when Parliament met three days later ‘Serjeant Browne’ was named to the important committees to bring in bills to settle the militia and to provide for a modified episcopacy. His last parliamentary committee was for the suppression of swearing on 10 Nov. He died on 11 Apr. 1668 and was buried at Arlesey. His will reveals considerable wealth, for he was able to leave a portion of £2,000 to each of his four daughters, besides other legacies totalling £1,000; but no later member of the family sat in Parliament.4Bowman diary, f. 52v; Beds. Hist. Rec. Soc. ii. 138, 143.