George Godsal joins as MD of corporate in London, reporting to CEO of MS&L London Kelly Walsh.
Previously, he set up H&K's East Africa business in Kenya and before that was head of corporate reputation at H&K London.
Godsal also spent time working in the US on secondment as acting director of comms for American Water, then owned by RWE and Thames Water.
'We're committed to expanding our corporate offer, as we see at it as being central to the growth of our UK team,' said Walsh.
Godsal will take charge of the group's portfolio of corporate clients in London, which includes Cathay Pacific, Coca-Cola, P&G and Rolex.