[1] Born in England, he represents Jamaica internationally and has competed for Great Britain in the past.

He was a member of the Great Britain Olympic Judo Team at London 2012 but was defeated in the second round by Hiroaki Hiraoka of Japan.

[2] McKenzie was first exposed to judo at the age of 11, when he got into a fight with a boy who stole his Charizard Pokémon card.

[8] McKenzie's first foray into the European U23 Championships in 2009 resulted in a bronze medal win at Antalya.

[10] In 2011, McKenzie earned bronze and gold in the European Cup competitions within Orenburg[11] and Hamburg,[12] respectively.

[19] McKenzie won bronze at the International Judo Federation Grand Slam 2016 in Baku.