Colman Getty will publicise a series of events in the city, including lectures and debates in the run-up to August.
The £10m exhibition – which will be set up within the Merseyside Maritime Museum – will feature displays on the former transatlantic slave trade, for which Liverpool was a major ferrying station.
Reporting to NML head of marcoms Tracey McGeagh, the account is led by senior account director Ruth Cairns.
The museum has been designed to mark the bicentenary of the abolition of the slave trade in Britain.
Until 1807, Liverpool had dominated the European slave industry.
SEPERATELY... Colman Getty celebrated 20 years in business last week, and marked the occasion by announcing the
creation of a dedicated events unit.