Email about the Captain America retrospective:
My understanding is that a person is most properly addressed by the highest office they have held, even after they retire, unless they have taken a different post that calls for a newer, if lower, title. The only exception is Royalty, who get complicated mixed titles.
Though his blue-gloved hand steered the Federal Reserve through the stormy stagflation crisis as if he were Adam Smith himself, Captain America's role as the Fed Chief under Carter means he has earned his current moniker "Chairman America."
Please be so kind as to address him appropriately.