Barclays President Robert Diamond will  play a key management role in the merged company, now that the $91 billion dollar deal has been agreed. Diamond has been serving as President of Barclays PLC since 2005 and is also an executive director of the bank.

At the time of the deal's announcement, Diamond, who was vice chairman of CSFB when he moved to Barclays in 1996, was responsible for the investment banking and investment management business of the company.