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An individual Joe Smith with a PhD would be addressed as Dr Smith or Joe Smith, PhD but not Dr Joe Smith, PhD.
It's called getting your PhD.
It depends what you are studying. The next step after masters academically is the PhD.
One can get information about studying a PHD course in Management at a number of different places. One in particular is at a local college or university, as they usually have the most information on their study courses.
He is not a Muslim, but he earned a PhD in studying Islam. He is actually a Roman Catholic.
Malcolm X: University of California Berkeley"What do you call a blackman with a Bachelors, Master's, or PHD?..You call him a N####r..."
That's up to the one studying for the PhD. There are many members of the armed forces studying for various degrees while still in the service. Whether it interferes with their current job schedule is something they must deal with.
PhD studies with University of KwaZulu-Natal in Pietermaritzburg, South Africa
Professor or Scientist. Sometimes (If they have a doctorate or a PhD) you can call them Doctor.
A Professor is someone who gained knowledge of a particular subject area: history, English, geography, math, business, etc studying for many years at a college or university. Most professors have to have a PhD. Although some can get jobs with a Masters' Degree.
Someone who has earned their PhD.
Usually someone wanting to be a university professor has earned their PhD or MFA. If you are working your way toward a Phd you may be a teaching assistant in the meantime.