Literally. John is a volunteer at Chicago's Museum of Science and Industry and he's usually in the vicinity of the The Great Train Story exhibit where he can be found answering visitor inquiries, like "What happens if I pour a bag of nickels all over these electrically conductive tracks?".
Okay. I'd didn't ask him that, opting instead to learn-by-doing.
He's a nice guy and most importantly, not only participated in the Work-a-Day Project , but also allowed me to lean way in and stabilize the TTV rig on the exhibit glass.
Like I said- nice guy.