
Magee will become vice-president marketing at Mars Chocolate UK, switching from his current role as global brand director for Mars in Australia.
He replaces Angela Willmott, who is moving internally to the role of Snickers global brand director.
He will now have responsibility for Mars' UK chocolate portfolio, which includes Galaxy, Maltesers, Milky Way and Mars.
Magee joined Mars from Kraft in 2010, where he was marketing director in Australia and New Zealand.
He has previously held several strategic marketing and senior commercial roles in Australia for Kraft and Cadbury Schweppes.
Magee will report to Fiona Dawson, president of Mars Chocolate UK.