Dee ihe ga-aga n'ihu na paragraf a - A mụrụ ya na Flint, Michigan ma gụchaa ụlọ akwụkwọ sekọndrị Davison. Thomas gbara hockey kọleji maka Mahadum nke Vermont ruo afọ anọ, site na 1993<unk>1997, n'oge nke a ka ndị Quebec Nordiques họpụtara ya na 217th n'ozuzu na 1994 NHL Entry Draft
Ọ dị mma. Ọ gbara ọtụtụ afọ na obere egwuregwu na Europe, tupu ọ banye na NHL mgbe ọ dị afọ iri abụọ na asatọ, ya na Boston Bruins. N'ikpeazụ, ọ pụtara dịka onye na-agba goolu Bruins na afọ 32. Thomas bụ onye mmeri ugboro abụọ nke Vezina Trophy (2009 na 2011) dị ka onye na-eche nche kacha mma nke NHL, ọ bụkwa onye otu Team USA na 2010 Winter Olympics na Vancouver. Thomas meriri Conn Smythe Trophy dịka onye ọkpụkpọ kachasị baa uru na 2011 Stanley Cup playoffs. Ọ bụ onye egwuregwu kacha okenye n'akụkọ ihe mere eme nke NHL iji merie onyinye ahụ mgbe ọ dị afọ 37. Thomas bụ otu n'ime ndị egwuregwu anọ amụrụ na America iji merie Conn Smythe Trophy, ya na Brian Leetch, Jonathan Quick, na Patrick Kane.