According to the message, sent by Morgan Stanley chief executive officer James Gorman, Mr Rosenthal, will take over the role from previous job holder Thomas R Nides.
The new post holder, who is currently head of corporate strategy at the bank, will be responsible for âfirmwide operations and technology, human resources, corporate communications, firmwide marketing, community affairs and corporate servicesâ, the communication showed.
He joined the bank from real estate firm Tishman Speyer in 2008 and has since been responsible for the merger of Morgan Stanley and Citigroupâs Smith Barney brokerage.
Mr Nides left the investment bank to work as deputy secretary of state for management and resources with the US government.
His successor will continue to work in his current job as well as taking on the additional responsibilities outlined in the message.
Previously, Mr Rosenthal, who graduated from Harvard Law School, joined Tishman in 2006 where he worked as chief financial officer.
By Jim Ottewill