This jump not only ensured him of a place in the American Olympic team, but also made him the top favourite for the gold medal at the 1956 Summer Olympics. In Melbourne, he did not disappoint, and grabbed the title in a new Olympic Record.
Next, he enrolled at the University of Southern California, winning the NCAA track and field title with the university team in 1958. In 1960, Dumas competed in his second Olympics, but a knee injury prevented him from winning a second medal, finishing 6th.
After his career, in which he won five consecutive national high jump titles, Dumas became a teacher, working at several schools in the Los Angeles area (including Jordan High School in Watts). He died of cancer at age 66 in Inglewood, California. He left behind three children: Keasha Dumas, Kyle Dumas and Ianna Dumas.