Mezue ahịrịokwu na-esonụ: Théodore na-egwuri egwu na-eto eto na Quebec Major Junior Hockey League (QMJHL), ebe o meriri iko President dịka ndị mmeri QMJHL ma soro ndị Hull Olympiques na-asọ mpi na Memorial Cup na 1995. O meriri ma Ford Cup dịka onye ọkpụkpọ kachasị agbachitere na Guy Lafleur Trophy dị ka MVP nke egwuregwu na 1995 ma bụrụkwa oge abụọ QMJHL Second Team All-Star. Ndị Canadiens họpụtara ya onye nke iri anọ na anọ n'afọ
1994, Théodore gbara afọ asatọ na Montreal, ebe o meriri Vezina na Hart trophies, ha abụọ n'afọ 2002. Na 2006, a gbanwere ya na Colorado Avalanche, ebe ọ gbara oge abụọ zuru ezu. Théodore gwakwara Washington Capitals bọọlụ afọ abụọ. Na mba ụwa, Théodore meriri nrite ọla edo na Canada na 1996 World Junior Championships, ebe akpọrọ ya onye na-edebe goolu kacha mma na asọmpi ahụ. Ọ malitekwara maka Canada na 2001 World Championships ma bụrụ onye nkwado maka 2004 World Cup.