He studied law in the Inner Temple, was called to the bar, and practised with success and high reputation.
In 1589 he was called to the degree of Serjeant-at-Law[2] and on 25 January 1592-3 was appointed a Judge of the Court of Common Pleas .
By his wife, who predeceased him, he had three sons and one daughter as follows: In 1598 Beaumont caught gaol fever (now believed to have been typhus) whilst presiding at the Assizes of the Northern Circuit, which was one of many so-called Black Assizes where disease spread from prisoners to attendees at court and caused widespread deaths within a few days.
Beaumont died at home at Grace-Dieu on 22 April 1598, and was buried on 12 June following, with heraldic attendance, in the parish church of Belton.
William Burton, the historian of Leicestershire, who was 23 when Beaumont died, called him a "grave, learned, and reverend judge".