He was educated at Eton and Corpus Christi College, Cambridge.
In 1766 Brownlow was elected to the House of Commons for Ilchester, a seat he held until 1774, and then represented Grantham between 1774 and 1776. The latter year he was raised to the peerage as Baron Brownlow, of Belton in the County of Lincoln. The peerage was chiefly in recognition of his father"s services.
Lord Brownlow married firstly Jocosa Katherina Drury, daughter of Sir Thomas Drury, 1st Baronet, in 1770.
They had one daughter. They had six children.
Royal Society; 12th Parliament of Great Britain. 13th Parliament of Great Britain. 14th Parliament of Great Britain.