King, a Texan who has lived in London for almost a decade, has an EMEA remit.
He reports to both Simon Miller, managing director of APCO UK, and US-based Evan Kraus, senior vice-president of APCO Online.
Prior to joining APCO, King was UK managing director of marketing company Fullsix. He has also worked in the digital and new-media arms of ad agencies J Walter Thomson and DDB Needham Worldwide Communications.
‘The UK is a key market for APCO and we will be seeking to grow the team here in the coming months,' King told PRWeek.
APCO Online clients include Pfizer, Coca-Cola and Welsh Development Agency.