Your introduction should complement the speaker's message and style. Always Introduce Every speaker deserves an introduction. It is, simply, polite to introduce the speaker. After all, the speaker is a guest and as the introducer, you are acting as their host. Your function as an introducer is to bridge the gap between the speaker and the audience, even if the speaker is well known.
Introductions also help prepare the audience for the next portion of the program.
Your mission is to invite the speaker to come forward while at the same time encouraging the audience into an attitude of active learning. The best way to do this is to be brief, yet complete. Strive for simplicity with dignity. If you understand your audience's needs and the speaker's qualifications to address those needs, you are well on the way to a successful introduction. First, offer information about the speaker's background, present position and accomplishments.