A speaker bureau is a company, or section of a company, that organizes to have speakers come in for different events. They will work out the logistics of getting the person (generally a famous person like an actor, singer, or politician) to come to the event, negotiate the speaking price, and discuss the goals of the talk. An organization might create a speaker bureau if they require a lot of speakers to attend their functions (such as fundraisers or conferences).
The reason for interviewing with any organization is because one believes that they will be an asset to the organization.
A Vision is defined as, "An Image of the future we seek to create." A Mission is defined as, "Purpose, reason for being." Defined simply "Who we are and what we do".
The reason is because they want to learn
Hitler was an excellent public speaker, which was a main reason why he got so many people to follow him.
He has written poetry about love
He has written poetry about love
The House Speaker is always a member of the majority party for the simple reason that he is elected by a majority vote of the House.
for no good reason
Depends on the individual speaker, and for what reason they are visiting.
The speaker closing the windows
I think you'll have to be more specific on that one.
First in line is the Vice-President.