He previously headed up New Century Media's financial comms team as a director. His career includes a five-year stint at Edelman and senior comms roles at FD, Cardew Group and PricewaterhouseCoopers.
Jonathan Flint, director of Citigate's corporate practice, said the agency's corporate offering would be boosted by Smith's 'experience in financial services, investment management, legal services and professional services'.
Flint added: 'He has expertise in international PR campaigns as well as advising partners and senior executives at the highest level.'
Smith advised Societe Generale after the Jerome Kerviel rogue trader scandal and has worked on the profile of Russian businessman Alexei Mordashov.