What is the proper title for a former U.S. President?
According to Wikipedia , we use "Mr. President" as the title for all presidents--either current or previous. E.g., President Obama.
This is a little weird, since Obama is not president anymore.
In past years, some guidebooks on manners maintained that in the U.S., the title should be reserved for the incumbent president only, and should not be used for former presidents, holding that it was not proper to use the title as a courtesy title when addressing a former president. Despite that, all living former U.S. Presidents continue to be addressed as "Mr. President", both formally and informally, and contemporary experts on etiquette now maintain that it is entirely appropriate.
In the United States, the title "Mr. President" is used in a number of formal instances as well: for example anyone presiding over the United States Senate is addressed as "Mr. President." Other uses of the title include presidents of state and local legislatures, however only the President of the United States uses the title outside of formal sessions.
Is the title "Emeritus" appropriate? Often used for former CEO's, etc. we may say "John Smith, President Emeritus."
So, could we say: "Barack Obama, President Emeritus"