In 2012, Brown finished third in the 400 m finals at the World Indoor Championships behind countryman Demetrius Pinder. He once again finished fourth in the Olympic 400 m final. He won his first Olympic gold medal four days later in the 4 × 400 m relay with Demetrius Pinder, Michael Mathieu and Ramon Miller, They beat the defending champions the United States, marking the first Olympic men's gold medal in any athletics event for the Bahamas and the first American loss in that race at the Olympics since 1972.