I was just thinking that maybe I shouldn't start with him walking in, but start it with him in like a comfy Professor chair, like Ludwig Von drake has, and have a whole bunch of diplomas, awards and pictures behind him to show that he is a very credible scientist. Something to think about.
Here are some clips from Home Improvement to give you a general idea.
I wanted to find an example of the announcer introducing Tool Time, but all I could find was it in this foreign language.
Examples of sponsors from the Flintstones
Examples of the kind of accents I want from this clip of Song of the South
9 years ago