Chichester, who began his career at Cazenove and has spent 15 years working in the City, will report to Steffan Williams, group managing director.
"I am delighted Charlie has agreed to come and join us. We have worked together in the past and the business will benefit from his many years of experience advising at a senior level in the City," said Williams, who is also a former partner at Finsbury.
In a statement today, AIM-listed Porta Communications, which owns Newgate and a number of other PR agencies such as Redleaf Communications and Publicasity, said: "Charlie will play a key role in the next stage of the company's development, increasing the size of its client base, strengthening the offering to the market and growing awareness of Newgate, particularly in the financial PR arena."
David Wright, chief executive officer at Porta Communications, described the appointment as "another in our sequence of very senior hires, continuing our strategy to strengthen and expand our integrated consultancy offering".