For an investment bank that prefers to stay under the radar, Robey Warshaw's appointment of former UK chancellor George Osborne is unusually high-profile. He is the first ever partner level hire at the boutique advisory firm, which has long leveraged the relationships of its three founding partners Sir Simon Robey, Simon Warshaw and Philip Apostolides to secure roles on multi-billion dollar deals, usually with blue-chip UK companies. Osborne has no direct investment banking experience, but his time in government and, latterly, as editor of the Evening Standard and a special adviser to BlackRock is likely to open some doors. Osborne described Robey Warshaw as the "best of the best" in a statement announcing his appointment. He will give up his portfolio career for a full-time position at the bank.

It's still a few weeks until Citigroup's new chief executive, Jane Fraser, takes the reins at the Wall Street bank, but she is already making changes. Zdenek Turek has been named as its new chief risk officer, a key role as the bank looks to overhaul its controls after regulators fined the bank for lapses last year. Sunil Garg, who currently leads Citi's commercial bank, will take charge of Citibank N.A, the vehicle that holds around 75% of the bank's assets. Margo Pilic who is currently finance lead for the institutional clients group at Citi's Latin American business, will become Fraser's chief of staff.