Thomas Dubois first represented France at racing at the 2017 World Cup in Ukraine. Before that, he was the French junior champion in biathlon and cross-country skiing. He finished second in biathlon and cross-country skiing at the senior French championships. Dubois became blind when he was an 8-year-old because of a genetic disorder. He needs to ski with a guide skier. Unlike other countries, Fédération française handisport does not give money to guide skiers to help blind skiers with the cost of competing. To get the right to go to and practice for the Winter Paralympics, it cost €21,000. Dubois had to raise money to be able to pay for that. Maubourguet Lions Club helped Dubois get the money for the Winter Paralympics.