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The proper title is Chairman.
What is the proper etiquette to addressing a Reverend in a letter?
"Your Honor" is proper.
The title "Chairman" should be capitalized when it directly precedes a person's name, such as "Chairman Smith." However, if used generically or not as part of a specific title, it does not need to be capitalized, for example, "The chairman of the committee."
Madam chairman is without doubt the most widely accepted, since "chairman" is considered by most to be gender neutral and has been around since the 17'th century. "Chairwomen" has also been around since that time (just a bit later), but is considered awkward and unnecessary by most people, since the person in question is usually obviously either a woman or a man - so, Madam chairman, or Mister chairman.
if the person leading the meeting and they are female, homosexual, lesbian or even male, then it is proper to use Chairperson..
The proper way to address a female boss in writing is to use Dear Miss and then the name. If she is married then use Ms. or Mrs. instead.
'Mister Charman,' or 'Madam Chairman' or "Sir' or 'Ma'am.'
Begin with "Dear sirs".
The proper way to address a business letter to two people is to include the titles of both recipients. An example of this would be, "Dear Dr. Jekyll and Mr. Hyde."
The proper way to address that letter would be "Mr. and Mrs. John Doe."
There is a great deal of confusion as to how to address a letter to an assembly woman in office. The proper salutation would be Dear Honorable and then their name.