Barber vs. Beautician vs. Hairstylist vs. Esthetician: Understanding the Differences

Question
What are the differences between a barber, beautician, hairstylists, and esthetician? And is it normal practice for any of them to shave someone's head?

Answer
James,
 First of all, my apology for the delayed response. A beautician and stylist are the same. They both will have studied cosmetology, encompassing a wide range of cutting, styling and chemical service training. Barbers are also given training in cutting and styling, but with additional specific training in "barbering" technique and shaving. Etheticians are trained specifically in skin care. If one wanted his head shaved using a clipper with a very close blade, that could be done by any "hair" person. For shaving with a razor, you would want a barber.
Best of luck to you,
Stephe (hairman)