Martin, currently a senior civil servant with a non-comms role in the Treasury's finance and industry directorate, becomes head of comms on 15 May. He replaces Paul Kissack, who is taking a career break.
The role involves accompanying Brown on official meetings, plus briefing economic and political editors and the major broadcasters on economic policy.
Martin will work closely with Brown's special adviser Damian McBride, who deals with political matters.
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