Whakakiia te rerenga e whai ake nei: I tohua a Harrison e te Toronto Maple Leafs i te rauna tuatoru, 82 o te katoa, o te
Ko te 2001 NHL Entry Draft. Whai muri i te wha tau i te American Hockey League (AHL) me te kapa ahuwhenua o Toronto, ka tiimata a Harrison i te NHL i te Hanuere 27, 2006, ki te Montreal Canadiens, i reira i tuhia ai e ia tana tohu NHL tuatahi, i puta mai i te ahua o te awhina. I te Pipiri 16, 2008, i hainatia e Harrison he kirimana kotahi tau me EV Zug o te Swiss National League A, engari i te Poutu-te-rangi 27, 2009, i hoki mai ia ki te Toronto Maple Leafs, i hainatia he kirimana, i whakawhiwhia ki te $ 475,000, ki te purei i te toenga o te tau 2008-09.