I whanau a McKinnon i te taone nui o Long Island o Sea Cliff, New York ki a Laura Campbell, he kaiwhakaako matua, me Michael Thomas Berthold, he kaihoahoa. He tuahine iti ake tana, a Emily Lynne. I mate tona papa i te 18 o ona tau. I a ia e tamariki ana, i purei a McKinnon i etahi taputapu. I tiimata tana purei piano i te 5 o ona tau, te cello i te 12 o ona tau, ka ako ia ia ki te purei kita i te 15 o ona tau. I puta ia i te Kura Tuarua o North Shore i te tau 2002, me te Whare Wananga o Columbia i te tau 2006 me te tohu i te whare tapere, i reira ia i whakaturia ai tetahi roopu whakangahau, Tea Party, i arotahi ki te whakangahau puoro. I Columbia, i whetu ia i nga whakaaturanga Varsity e toru: V109 "Dial for Deadline", V110 "Off-Broadway" me V111 "The Sound of Pranges".
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