Born in Cardiff, Wales, Brace represents the Irish Rugby Football Union as a referee, and was an international player for Belgium.
[3][4] Brace continued working as a community rugby officer until 2017 when, together with George Clancy, John Lacey and Joy Neville he was one of seven referees offered professional contracts by the IRFU.
On 3 April 2015 he refereed the 2014–15 British and Irish Cup final between Worcester Warriors and Doncaster Knights.
[2][13] On 14 November 2015 Brace made his European Rugby Challenge Cup debut, taking charge of a 2015–16 pool stage match between Gloucester and Zebre.
[2][6] On 15 October 2016 Brace made his European Rugby Champions Cup debut, taking charge of a 2016–17 pool stage match between Wasps and Zebre.
[2][14] On 22 April 2017 Brace took charge of the 2016–17 European Rugby Challenge Cup semi-final between La Rochelle and Gloucester.
[5] In November 2017 Brace took charge of his first competitive test match between England and Samoa, a 2019 Rugby World Cup qualifier between Canada and the United States.