He began competing the sprints in his youth and, while studying at Bridgeport High School, he came third in the
200 metres at the
Jamaican High School Championships. In his international debut at the
2007 CARIFTA Games he came third in the
100 metres and runner-up in the 200 m, behind compatriot
Dexter Lee, setting personal bests of 10.65 seconds and 21.25 seconds in the process. He transferred to
Calabar High School in
Kingston, Jamaica, but did not compete much from 2008 to 2010, during which time he moved to
New York City. Continuing with his training, he set a series of personal bests in 2011, running 6.77 seconds for the
60 metres, 10.39 seconds for the 100 m, and 20.90 seconds for the 200 m. He brought his bests down further in 2012 (10.26 and 20.72), but did not compete at any major events. He began working with a new coach, Bryn Davis, in 2013 and he pairing delivered results. In April and May, Brown set outdoor personal records of 20.29 seconds and 46.64 seconds for 200 m and 400 m distance. Brown and Weir were joined by
Nickel Ashmeade and
Yohan Blake in the final, where they broke the
world record for the event, taking the gold medal in 1:18.63 minutes. This improved upon the 20-year-old mark set by the
Santa Monica Track Club. ==Personal bests==