The son of a former Mayor of Waardamme, in northern Belgium, Baron Gaston Peers de Nieuwburgh was one of twins. In the 1800s he went to live in Argentina where he was the Administrator of the Belgian Colony of La Barrancosa. De Nieuwburgh married one of Argentina’s socialites Ernestina Costa Oliveira Cézar in 1899. Nearly all his polo prior to the 1920 Olympics was played in Argentina and in 1900 he reached the final of the P.A.R.P. open with his own San Carlos team. The following year they won the River Plate Open Championship, the forerunner of the Argentine Open to become the only Belgian to win the trophy. With Sociedad Sportiva in 1908 he won the Copa Anchorena (now the Tortugas Open and one of Polo’s Triple Crown events). At the Olympics Peers de Nieuwburgh played at back for Belgium in their two matches.