The New York Islanders selected him with the sixteenth overall choice in the 2015 NHL Entry Draft. He previously represented Canada at the 2014 Ivan Hlinka Memorial Tournament, where he won gold.
At the age of four, he began playing organized hockey. Prior to his NHL debut, he was drafted first overall in the 2012 WHL Bantam Draft by the Seattle Thunderbirds.
He set an Islanders rookie record most assists in a single game in October 2017 when he had five against the Colorado Avalanche.
Liana is his sister's name.
He has been teammates with defenceman Sebastian Aho on the Islanders.