Tuhia he whakamāramatanga mō tēnei wāhanga - He kaitākaro whetū a Maguire mō te Kura o Delbarton, nāna i āwhina i tana kapa kia wikitōria i ngā Ipu Mennen e whā i te wā kotahi, ā, i wikitōria hoki i tētahi wāhanga o te toa ā-rohe i a ia e tamariki ana. I muri i tana tohu i te tau 1990, i tohua ia e nga Montreal Canadiens i te NHL Draft
kātahi ka tīmata ki te haere ki te Whare Wānanga o Harvard i te ngahuru. Ko Maguire he kaitakaro tiaki-a-roto i te whare wānanga, e takaro ana ki nga hoa whawhai uaua ake, engari i taea tonu e ia te awhina i te Crimson kia mutu i runga i te ECAC Hockey standings mo nga tau e toru i te raupapa. I tana tau whakamutunga, ka ora te kemu whakaeke a Maguire ana neke atu i te taarua o tana mahi o mua. I whakaingoatia ia hei All-American ka akiaki i a Harvard ki te toa ECAC me te ahua i roto i te Frozen Four.