Pari gbolohun ti o tẹle: Gillies ṣe ere hockey ile-ẹkọ giga pẹlu awọn Providence Friars ni apejọ NCAA Awọn ọkunrin Division I Hockey East. Ni ọdun akọkọ rẹ, ere ti o tayọ ti Gillies ni a san pẹlu yiyan si 2012<unk>13 Gbogbo-Hockey East First Team. Ó jẹ́ agbójú-lé fún orílẹ̀-èdè Amẹ́ríkà nígbà ìdíje World Cup
2014 World Juniors ati ki o dun fere gbogbo iṣẹju ti awọn idije, sugbon kuna lati medal. Nigba akoko ọdọ rẹ, Gillies mu awọn Friars lọ si akọle NCAA, ti a yan gẹgẹbi Oludari ti o dara julọ ti Frozen Four.