This year's G8 summit will be held in St Petersberg in July. It will be the first such meeting on Russian soil.
Ketchum's role will be to communicate the summit's core areas of interest: energy security, infectious disease and education.
It will aid the Kremlin with logistical and comms support around the summit, producing briefing material and a website. It reports to Russian first deputy press secretary Dmitry Peskov.