Who Is Tea Doctor?谁是“茶博士”?

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“Hi, Tea Doctor! Can I have a cup of tea?” Sometimes on Chinese TV shows, we can hear people say that in a teahouse. Then a man comes to serve tea for the guests. Why do people call him the “Doctor”? Does he have a doctoral degree?
The man who loves tea
*Lu Yu was the first person to be called “Tea Doctor”. He lived in the Tang Dynasty. When he was a little boy, he was interested in tea. Lu Yu traveled around China to study different kinds of tea and gather tea leaves.
*Lu Yu 陆羽,唐代茶学家。(剩余1320字)