Derek started cycling competitively at age 9, picking up track cycling at age 13. His father was a road cyclist and they had an ongoing competition to see who would win a national title first; in 2014 his dad became national road race champion in the 50+ age category but since then Derek has won 14 national titles on the road and the track.

A career highlight came at the 2019 UCI Track World Championships where the team exceeded expectations by racing for the bronze medal against an experienced Danish squad, ultimately finishing fourth overall. In his Olympic debut at Tokyo 2020, Gee was a member of the men’s team pursuit that finished fifth for Canada’s best Olympic result in the event since 1932. 

Derek currently races for the Israel Premier Tech team. In 2023, he made his World Tour debut at the Giro d’Italia, where he susprised both himself and the world with four second-place stage finishes, as well as second-place standings in both the KOM and Sprint classifications.