In a letter, you should address a female chairman as "Dear Ms. [Last Name]" if you know her name. If she holds a specific title, such as "Chairwoman," you can use "Dear Chairwoman [Last Name]." If you are unsure of her preference or title, "Dear [Full Name]" is also appropriate. Always ensure you use respectful language throughout the letter.
The proper title is Chairman.
"Your Honor" is proper.
What is the proper etiquette to addressing a Reverend in a letter?
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..
It is capitalized at the beginning of the sentence or when it forms part of the proper noun or when it precedes a person's name or when it is used as a direct address. Examples: Chairman Justin Are you ready, Chairman?
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."
No honorific is required when addressing the former chairman of a committee.
That is a proper spelling of "co-chairman" (one of two or more joint chairmen).