In 1990, Marcus won Bahamas' first boys 400m gold medal with a time of 47.30s at the Caribbean’s track and field championships, the CARIFTA Games in Kingston Jamaica. The was a huge blow to the then Jamaican youth track powerhouse and brought significant pride to Bahamians everywhere. In the following year 1991, Marcus would be Bahamas’ first junior athlete to run under 47 seconds in the 400m with a time of 46.92s, coming in second and also earning a silver in the 200m with a time of 21.39s. According to the BAAA records website (see here), Marcus still held the Bahamas Boys High school under 20 200m Championship record of 21.11s while he attended Catholic High in Grand Bahamas.

This Bahamian 400m domination started by Marcus in 1990 and 1991 would open the door for many more gold medals in the CARIFTA games afterwards by Bahamians, including World Champion Avard Moncur, creating a pipeline of Bahamian athletes dominating the 400m on the world stage. Since Marcus’ first Bahamas 400m men's Gold medal at CARIFTA, as of Jan 2025 there have been 8 more Bahamas CARIFTA Gold medals in both U 20 and U17, as well as 20 silver and Bronze. Bahamas ranks 3rd in the number of Male 400m Gold medals at CARIFTA since 1990 (8 golds), with Jamaica leading the way (33 golds) and Trinidad second (9 Golds). Grenada ranks 4th (5 golds). At CARIFTA 2025, we saw a new Bahamian champion emerge, Eagan Neely, winning the U17 men's gold in the 200m, 400m, 4x100m and 4x400m.  

The Bahamas went on to have 400m men's World Champion and relay medalists (Avard Moncur, Troy Mcintosh, Chris Brown, Stephen Gardiner), Olympic Champions (Stephen Gardiner) as well as men’s 4x400m Olympic gold. 

Marcus injured out of international competition while competing at Compton Community College in CA and Morgan state University in MD, but continued to stay active in Master’s competitions as well as coaching his daughters in high school in the US. Marcus has been giving back to the Bahamas youth athletics by visiting family islands and holding track training sessions as well as partnering with US companies to donate sports equipment like running shoes. Marcus’ vision is for a stronger, united Bahamian island network where all athletes from every Bahama island are given the equal chance and opportunity to develop their natural athletic gift. He believes the strength of Bahamas’ world dominance in track and field lies in leveraging the talent that exists in every island.