The proper salutation in English for either a medical doctor or the holder of a Ph.D. is the same for either male or female. It is simply "Doctor".
In English, the salutation for a doctor, whether they are a medical doctor or the holder of a Ph.D. is the same for both male and female. It is Doctor.
The proper salutation for a probate judge is "The Honorable [Judge's Full Name]."
What is the proper salutation for a register of wills, e.g. Honorable John White?
The proper salutation when writing to a judge is "Dear Judge [Last Name]" or "Your Honor."
the correct salutation for two men is Messrs
Hello.
Your Honor
Dean actually is the proper salutation. One could say: Dean Redmond, would you please sign this form? Alternatively you could just use the Dr. salutation or the Professor salutation if those are appropriate, which they generally are.
The proper salutation for a doctor is doctor or professor depending on their title. In writing the short form can be used which will be Dr. or Prof.
It should not matter what ethnicity the person is when you are addressing them either formally or informally. Mr. and Mrs./Ms. should be used if you are writing to the person in English.
A proper salutation for greeting the president of a business is "Dear Mr. President". To conclude a letter, the proper word is "Sincerely" and a the name of the writer.