A New Zealander born in Fiji, Parker was 17 when he started working on New Zealand television in the glitzy series Gloss. He followed with roles in numerous other local dramas including four years playing the popular Guy Warner on the hit show, 'shortland Street.
Throughout this time, he also performed in a number of theatre productions including Macbeth, Rosencrantz and Guildenstern are Dead, The Rocky Horror Show and, his favourite, The Pillowman.
His international work began with Xena: Warrior Princess and Young Hercules but It was playing the doomed elf, Haldir of Lorien, in the Lord of the Rings movies, The Fellowship of the Ring and The Two Towers that really introduced him to the world of fandom.
He recently played the very dirty Lycan, Sabas in Underworld: Rise of the Lycans, was the villain with great hair, Darken Rahl in ABC's, The Legend of the Seeker. and currently plays Spartacus chief nemesis, the Roman Praetor, Gaius Claudius Glaber, in the Starz original series, 'spartacus: Blood and Sand, and 'spartacus: Vengeance.