Article THE before a title

Yes, you do.

My brother is the Director of Transportation with the county.
She is the Principal of Lucid Elementry School.

I am getting three different opinions:

1. Need "the."
2. Don't need.
3. Optional.


There is another one that is confusing:

In an email, do I say:

1. Hi, BMO,
2. Hi BMO,

Writing in a novel: when she met him, she said: "Hi, BMO" or "Hi BMO?"

Thanks.

Another vote for optional, on all examples, BMO-- optional articles, optional commas.

Good luck.

I suppose it is optional, but you'd definitely have to say, "Could I speak to the Director of Transportation?"

If that is definite, then it is not optional.

Mr. Smith, Director of Transportation, has been with the department since the 1970s. Would you have the article here?

There is no need to have the article there.

Yes, precisely, it would be wrong had it a the in front of the title. Thanks again.

it would have been wrong too. Thanks again.

One must place a comma after an interjection at the beginning of a sentence: "Hi, BMO." "Hello, BMO."