Mezue ahịrịokwu na-esonụ: Gregg kasị mma agwụ na FIS Nordic World Ski Championships bụ nke atọ na 10 km freestyle na Falun na
Afọ 2015. Nke abụọ ya kacha mma bụ nke iri na anọ na 4 × 5 km relay na Liberec na 2009 ebe nke abụọ ya kacha mma n'otu n'otu bụ 48th na 30 km mass start ihe omume na otu egwuregwu ahụ.