If you are the speaker, it is acceptable to write your own introduction for the occasion. The introducer will be happy to have it and it gives you an opportunity to expand your speech and personalize your background in ways that you would be more comfortable with someone else doing. I like to help welcome the speaker to the podium or lectern with a friendly handshake. It disturbs me when I am in the audience and the introducer leaves the lectern and turns his or her back on the speaker. You are aiming for continuity not the big disconnect.
Introductions are like giving a gift.
You wrap it in colorful paper and tie it with ribbon to help create anticipation, excitement and a sense of the occasion. All rights reserved.