Either: John Doe Smith

Or: John Michael Doe

Either: John Doe Smith

Or: John Michael Doe

John Doe on behalf of the minor John Doe, Jr.

Or John Doe as guardian of the minor John Doe, Jr.

Etiquette (and yes, it's still used) is the man's name goes first. Examples: * Mr. & Mrs. John Doe * Mr. John Doe & Jane Doe, M.D. * Mr. John Doe and Dr. Jane Doe * Dr. John Doe and Mrs. Jane Doe * Drs. John and Jane Doe * Dr. John Doe & Dr. Jane Doe * Mr. & Mrs. J. Doe * Honorable John Doe and Mrs. Jane Doe (only used for invitations to the couple.)

It is proper to address Mr. John Doe PhD as Dr. John Doe. You might also address Mr. John Doe PhD as Mr. Doe or Doctor Doe, depending on which reference he prefers.