Whakaotihia te rerenga e whai ake nei: I tiimata a Theodore i tana mahi hokai iti me te Aldergrove Minor Hockey Association, i te wa i whakapumautia ai ia hei kaitakaro tino rongonui i roto i te hitori o te roopu. Ko tana mahi angitu iti i riro i a ia he kowhiringa i te 2010 WHL Bantam Draft, na te Seattle Thunderbirds. I a ia e noho ana ki te kapa, ko Theodore te rangatira me te whakataetae mo Team Canada i nga whakataetae o te ao. I riro i a ia he mētara koura i te 2013 IIHF World U18 Championships me
2015 World Junior Ice Hockey Championships me te mētara hiriwa i te 2019 IIHF World Championship.