"MD" would rarely be a representative capacity, because an MD would seldom sign a document as a representative of her patient. If there were something special about the document such that it would only be valid if signed by a physician (maybe a copy of a medical record) the physician might be signing it in the capacity of a physician, but that would not be a representative capacity. If the document had nothing to do with medicine, I'd expect MD to be a description. And if it were signed "John Doe MD PC" then it probably would be a representative capacity because PC means professional corporation, and John Doe would appear to be signing as a representative of the professional corporation.
As for III, Jr., Sr., West's Legal Encyclopedia (2nd ed.) under the JUNIOR entry says "When used in a proper name, junior or its abbreviation, Jr., is merely descriptive and not part of the individual's legal name. The absence of the term at the end of a name has no legal consequences. A signature that omits the description is still valid." But that is just a generalization and the law in a particular state could be different. |
