The speaker whom you are introducing has a history that relates to his topic. Present this history by highlighting specific events that connect your speaker to the speech. This sets him out as an authority in his field and provides a basis for credibility to the audience. Additionally, this frees him from having to establish his own authority and allows him to move more fluidly into the points of the speech. Double check your facts though and make sure that you are providing an accurate and respectful history of your speaker.
Research into your speaker's work should reveal some interesting quotes that are pertinent to the speech topic. Read through her body of contributions to the field. Make sure that the quote you choose offers a unique piece of insight from your speaker regarding the theme of her speech. Effective quotations demonstrate a unique insight that your speaker has in the overall subject. Select a quote that is especially impactful or broadly touches on the ideas that she will later expand upon in her speech.
Your speaker's focus will center around a specific topic. You can set the scene for him by establishing, for the audience, the context of the topic. Provide specific information regarding the nature and significance of the situation. If your speaker is going to discuss global pollution issues, provide specific statistics that show the rise in pollution during recent years and the necessary levels of attention required to address the problem. This helps your speaker by preparing his audience and establishing a clear picture of the need to listen to his suggestions.
You should prepare for your introduction speech by discussing, with your speaker, the necessary elements that she wishes you to relate in your introduction. Give her your ideas and listen to any suggestions for material she wishes you to cover. Your responsibility as an introductory speaker is to assist the main speaker. Her input is a valuable source of inspiration for you and will help you write a supportive introductory speech.