MediaVest had previously worked for The Imperial War Museum, which develops creative in house.
Total Media's first task is to work on plans to promote the Women and War and Ravillious Art exhibitions that launch in October. The agency also works for Tate Gallery and the National Gallery.
Nigel Potter, joint managing director at Total Media, said: "We are delighted to be working with Imperial War Museum. It has several exciting exhibitions coming up over the next few months, which we strongly believe will be extremely successful."
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