Nyora kupfuurira kweiyi ndima - Akaberekerwa muFlint, Michigan uye akapedza kudzidza paDavison High School. Thomas akatamba hockey yekoreji yeYunivhesiti yeVermont kwemakore mana, kubva muna 1993 kusvika muna 1997, panguva iyo yaakasarudzwa 217th yakazara neQuebec Nordiques muna 1994 NHL Entry Draft
. Akatamba kwemakore anoverengeka muzvikwata zviduku uye Europe, asati aenda kuNHL pazera remakore makumi maviri nemasere, neBoston Bruins. Pakupedzisira akabuda somurindi mukuru weBruins pazera remakore 32. Thomas ndiye akahwina kaviri Vezina Trophy (2009 na2011) semubati wepagedhi akanakisa weNHL, uye aive nhengo yeChikwata cheUSA mu2010 Winter Olympics muVancouver. Thomas akahwina Conn Smythe Trophy semutambi anokosha zvikuru mumakwikwi e2011 Stanley Cup. Akanga ari mutambi mukuru munhoroondo yeNHL kuti akunde mubairo pazera remakore 37. Thomas ndomumwe wevatambi vana vakazvarwa muAmerica kuti vakunde Conn Smythe Trophy, pamwe naBrian Leetch, Jonathan Quick, naPatrick Kane.