Rennie started playing the Boehm system flute at an early age. Initially learning classical music, he soon found his heart lay in the Celtic traditional music. He switched to playing the wooden flute under the tutelage of leading New Zealand flute players, Pat Higgins and Brendyn Montgomery, as well as wooden flute maistro Chris Norman from Canada. Rennie spent a year in Canada and USA studying flute and performing with some of Celtic music’s leading musicians including Chris Norman, David Greenberg, and Catherine McEvoy. In 2016 he received a Boxwood scholarship for rising young performers.
Rennie has music in his veins and plays many instruments which he incorporates in his performances to great effect. He currently lives in Golden Bay.