The man in back is an ornamental iron apprentice.
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While this looks like the ultimate in having someone look over ones shoulder having an experianced welder demonstrate welding to a student who is closely observing is a very good teaching method.  However, the student should have his own helmet.  
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Having the student focus on a bead being made with proper technique, then the instructor coaching the student from the same distance can be very benificial. - anvilfire guru.