Hi Brandon: As a guest, we would hope the guest speaker would be willing to defer to the teachers wishes. One way to handle this is to demonstrate you're in charge. Discussion beforehand is vital. When the speaker arrives, ask them them to sit until you're ready to introduce the next "activity". You may introduce the speaker and state the exaxt points you've discussed beforehand in your introduction. Also, you can ask the class to give the speaker their attention, and rather than interrupting, you'll moderate questions at the end. Questions are an important component of the guest speaker experience, so we want to encourage them. Just stand in speakers position so as to have the questions come to you. Then, maybe you can rephrase the question to the speaker. Both student and speaker soon get a claer picture whose in chargre. Regards, Barry