Yes, someone with a DPhil degree is typically referred to as "Dr" in an academic context. The DPhil is a doctoral degree, and holders are entitled to use the title of "Dr" as a courtesy.
Doctor of Philosophy
Soros went to London School of Economics (BA, MA, DPhil)
DPhil is the abbreviation Oxford (and some other universities, mainly in the commonwealth) uses for "doctor of philosophy". PhD is the more common abbreviation, used by Cambridge, for instance, and most US universities. Note that there's a large difference between a PhD at a US university and a DPhil (or PhD) in the UK. The former usually involves a lot more course work (and takes at least 5 years), since you can enter the programme with a bachelor's degree, whereas in the UK you're usually expected to hold a master's degree already when you start your DPhil or PhD (which will typically take you 4 years to complete).
The full form of PhD is Doctor of Philosophy. It is also written as Ph.D or DPhil.
George Soros went to London School of Economics (BA, MA, DPhil)
Susan Rice went to Stanford University (BA)New College, Oxford (MPhil, DPhil)
Yes, it is appropriate to address someone with a Ph.D. as "Dr." as a sign of respect for their academic achievement.
Yes, it is appropriate to refer to someone with a PhD as "Dr." as a sign of respect for their academic achievement.
When addressing someone with a PhD in an email, it is appropriate to use "Dr." followed by their last name. For example, "Dr. Smith."
In a professional setting, it is proper etiquette to address someone with the title "Dr." or "PhD" by using their title followed by their last name. For example, you would address someone as "Dr. Smith" or "Dr. Johnson" when speaking to them in a professional context.
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Yes, it is appropriate to address someone with a PhD as "Dr." in email correspondence as a sign of respect for their academic achievement.